81351920

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{23}}^1\times {\mathrm{179}}^1$

素因数の和:247

約数の個数: 160

約数和(自身を含む): 224985600

約数和(自身を除く): 143633680

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 19, 20, 23, 26, 38, 40, 46, 52, 65, 76, 80, 92, 95, 104, 115, 130, 152, 179, 184, 190, 208, 230, 247, 260, 299, 304, 358, 368, 380, 437, 460, 494, 520, 598, 716, 760, 874, 895, 920, 988, 1040, 1196, 1235, 1432, 1495, 1520, 1748, 1790, 1840, 1976, 2185, 2327, 2392, 2470, 2864, 2990, 3401, 3496, 3580, 3952, 4117, 4370, 4654, 4784, 4940, 5681, 5980, 6802, 6992, 7160, 8234, 8740, 9308, 9880, 11362, 11635, 11960, 13604, 14320, 16468, 17005, 17480, 18616, 19760, 20585, 22724, 23270, 23920, 27208, 28405, 32936, 34010, 34960, 37232, 41170, 44213, 45448, 46540, 53521, 54416, 56810, 65872, 68020, 78223, 82340, 88426, 90896, 93080, 107042, 113620, 136040, 156446, 164680, 176852, 186160, 214084, 221065, 227240, 267605, 272080, 312892, 329360, 353704, 391115, 428168, 442130, 454480, 535210, 625784, 707408, 782230, 856336, 884260, 1016899, 1070420, 1251568, 1564460, 1768520, 2033798, 2140840, 3128920, 3537040, 4067596, 4281680, 5084495, 6257840, 8135192, 10168990, 16270384, 20337980, 40675960, 81351920]

約数ペア:

[(1, 81351920), (2, 40675960), (4, 20337980), (5, 16270384), (8, 10168990), (10, 8135192), (13, 6257840), (16, 5084495), (19, 4281680), (20, 4067596), (23, 3537040), (26, 3128920), (38, 2140840), (40, 2033798), (46, 1768520), (52, 1564460), (65, 1251568), (76, 1070420), (80, 1016899), (92, 884260), (95, 856336), (104, 782230), (115, 707408), (130, 625784), (152, 535210), (179, 454480), (184, 442130), (190, 428168), (208, 391115), (230, 353704), (247, 329360), (260, 312892), (299, 272080), (304, 267605), (358, 227240), (368, 221065), (380, 214084), (437, 186160), (460, 176852), (494, 164680), (520, 156446), (598, 136040), (716, 113620), (760, 107042), (874, 93080), (895, 90896), (920, 88426), (988, 82340), (1040, 78223), (1196, 68020), (1235, 65872), (1432, 56810), (1495, 54416), (1520, 53521), (1748, 46540), (1790, 45448), (1840, 44213), (1976, 41170), (2185, 37232), (2327, 34960), (2392, 34010), (2470, 32936), (2864, 28405), (2990, 27208), (3401, 23920), (3496, 23270), (3580, 22724), (3952, 20585), (4117, 19760), (4370, 18616), (4654, 17480), (4784, 17005), (4940, 16468), (5681, 14320), (5980, 13604), (6802, 11960), (6992, 11635), (7160, 11362), (8234, 9880), (8740, 9308)]