640625660

素因数分解:

$2^2\times 5^1\times {\mathrm{19}}^1\times {\mathrm{29}}^1\times {\mathrm{61}}^1\times {\mathrm{953}}^1$

素因数の和:1071

約数の個数: 96

約数和(自身を含む): 1490529600

約数和(自身を除く): 849903940

約数列:

[1, 2, 4, 5, 10, 19, 20, 29, 38, 58, 61, 76, 95, 116, 122, 145, 190, 244, 290, 305, 380, 551, 580, 610, 953, 1102, 1159, 1220, 1769, 1906, 2204, 2318, 2755, 3538, 3812, 4636, 4765, 5510, 5795, 7076, 8845, 9530, 11020, 11590, 17690, 18107, 19060, 23180, 27637, 33611, 35380, 36214, 55274, 58133, 67222, 72428, 90535, 110548, 116266, 134444, 138185, 168055, 181070, 232532, 276370, 290665, 336110, 362140, 525103, 552740, 581330, 672220, 1050206, 1104527, 1162660, 1685857, 2100412, 2209054, 2625515, 3371714, 4418108, 5251030, 5522635, 6743428, 8429285, 10502060, 11045270, 16858570, 22090540, 32031283, 33717140, 64062566, 128125132, 160156415, 320312830, 640625660]

約数ペア:

[(1, 640625660), (2, 320312830), (4, 160156415), (5, 128125132), (10, 64062566), (19, 33717140), (20, 32031283), (29, 22090540), (38, 16858570), (58, 11045270), (61, 10502060), (76, 8429285), (95, 6743428), (116, 5522635), (122, 5251030), (145, 4418108), (190, 3371714), (244, 2625515), (290, 2209054), (305, 2100412), (380, 1685857), (551, 1162660), (580, 1104527), (610, 1050206), (953, 672220), (1102, 581330), (1159, 552740), (1220, 525103), (1769, 362140), (1906, 336110), (2204, 290665), (2318, 276370), (2755, 232532), (3538, 181070), (3812, 168055), (4636, 138185), (4765, 134444), (5510, 116266), (5795, 110548), (7076, 90535), (8845, 72428), (9530, 67222), (11020, 58133), (11590, 55274), (17690, 36214), (18107, 35380), (19060, 33611), (23180, 27637)]