20957560

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{41}}^1\times {\mathrm{983}}^1$

素因数の和:1048

約数の個数: 64

約数和(自身を含む): 52073280

約数和(自身を除く): 31115720

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 41, 52, 65, 82, 104, 130, 164, 205, 260, 328, 410, 520, 533, 820, 983, 1066, 1640, 1966, 2132, 2665, 3932, 4264, 4915, 5330, 7864, 9830, 10660, 12779, 19660, 21320, 25558, 39320, 40303, 51116, 63895, 80606, 102232, 127790, 161212, 201515, 255580, 322424, 403030, 511160, 523939, 806060, 1047878, 1612120, 2095756, 2619695, 4191512, 5239390, 10478780, 20957560]

約数ペア:

[(1, 20957560), (2, 10478780), (4, 5239390), (5, 4191512), (8, 2619695), (10, 2095756), (13, 1612120), (20, 1047878), (26, 806060), (40, 523939), (41, 511160), (52, 403030), (65, 322424), (82, 255580), (104, 201515), (130, 161212), (164, 127790), (205, 102232), (260, 80606), (328, 63895), (410, 51116), (520, 40303), (533, 39320), (820, 25558), (983, 21320), (1066, 19660), (1640, 12779), (1966, 10660), (2132, 9830), (2665, 7864), (3932, 5330), (4264, 4915)]