18989360

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{31}}^2$

素因数の和:107

約数の個数: 120

約数和(自身を含む): 51715440

約数和(自身を除く): 32726080

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 19, 20, 26, 31, 38, 40, 52, 62, 65, 76, 80, 95, 104, 124, 130, 152, 155, 190, 208, 247, 248, 260, 304, 310, 380, 403, 494, 496, 520, 589, 620, 760, 806, 961, 988, 1040, 1178, 1235, 1240, 1520, 1612, 1922, 1976, 2015, 2356, 2470, 2480, 2945, 3224, 3844, 3952, 4030, 4712, 4805, 4940, 5890, 6448, 7657, 7688, 8060, 9424, 9610, 9880, 11780, 12493, 15314, 15376, 16120, 18259, 19220, 19760, 23560, 24986, 30628, 32240, 36518, 38285, 38440, 47120, 49972, 61256, 62465, 73036, 76570, 76880, 91295, 99944, 122512, 124930, 146072, 153140, 182590, 199888, 237367, 249860, 292144, 306280, 365180, 474734, 499720, 612560, 730360, 949468, 999440, 1186835, 1460720, 1898936, 2373670, 3797872, 4747340, 9494680, 18989360]

約数ペア:

[(1, 18989360), (2, 9494680), (4, 4747340), (5, 3797872), (8, 2373670), (10, 1898936), (13, 1460720), (16, 1186835), (19, 999440), (20, 949468), (26, 730360), (31, 612560), (38, 499720), (40, 474734), (52, 365180), (62, 306280), (65, 292144), (76, 249860), (80, 237367), (95, 199888), (104, 182590), (124, 153140), (130, 146072), (152, 124930), (155, 122512), (190, 99944), (208, 91295), (247, 76880), (248, 76570), (260, 73036), (304, 62465), (310, 61256), (380, 49972), (403, 47120), (494, 38440), (496, 38285), (520, 36518), (589, 32240), (620, 30628), (760, 24986), (806, 23560), (961, 19760), (988, 19220), (1040, 18259), (1178, 16120), (1235, 15376), (1240, 15314), (1520, 12493), (1612, 11780), (1922, 9880), (1976, 9610), (2015, 9424), (2356, 8060), (2470, 7688), (2480, 7657), (2945, 6448), (3224, 5890), (3844, 4940), (3952, 4805), (4030, 4712)]