21545620

素因数分解:

$2^2\times 5^1\times {\mathrm{19}}^1\times {\mathrm{31}}^2\times {\mathrm{59}}^1$

素因数の和:149

約数の個数: 72

約数和(自身を含む): 50047200

約数和(自身を除く): 28501580

約数列:

[1, 2, 4, 5, 10, 19, 20, 31, 38, 59, 62, 76, 95, 118, 124, 155, 190, 236, 295, 310, 380, 589, 590, 620, 961, 1121, 1178, 1180, 1829, 1922, 2242, 2356, 2945, 3658, 3844, 4484, 4805, 5605, 5890, 7316, 9145, 9610, 11210, 11780, 18259, 18290, 19220, 22420, 34751, 36518, 36580, 56699, 69502, 73036, 91295, 113398, 139004, 173755, 182590, 226796, 283495, 347510, 365180, 566990, 695020, 1077281, 1133980, 2154562, 4309124, 5386405, 10772810, 21545620]

約数ペア:

[(1, 21545620), (2, 10772810), (4, 5386405), (5, 4309124), (10, 2154562), (19, 1133980), (20, 1077281), (31, 695020), (38, 566990), (59, 365180), (62, 347510), (76, 283495), (95, 226796), (118, 182590), (124, 173755), (155, 139004), (190, 113398), (236, 91295), (295, 73036), (310, 69502), (380, 56699), (589, 36580), (590, 36518), (620, 34751), (961, 22420), (1121, 19220), (1178, 18290), (1180, 18259), (1829, 11780), (1922, 11210), (2242, 9610), (2356, 9145), (2945, 7316), (3658, 5890), (3844, 5605), (4484, 4805)]