20013680

素因数分解:

$2^4\times 5^1\times {\mathrm{23}}^1\times {\mathrm{73}}^1\times {\mathrm{149}}^1$

素因数の和:258

約数の個数: 80

約数和(自身を含む): 49550400

約数和(自身を除く): 29536720

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 23, 40, 46, 73, 80, 92, 115, 146, 149, 184, 230, 292, 298, 365, 368, 460, 584, 596, 730, 745, 920, 1168, 1192, 1460, 1490, 1679, 1840, 2384, 2920, 2980, 3358, 3427, 5840, 5960, 6716, 6854, 8395, 10877, 11920, 13432, 13708, 16790, 17135, 21754, 26864, 27416, 33580, 34270, 43508, 54385, 54832, 67160, 68540, 87016, 108770, 134320, 137080, 174032, 217540, 250171, 274160, 435080, 500342, 870160, 1000684, 1250855, 2001368, 2501710, 4002736, 5003420, 10006840, 20013680]

約数ペア:

[(1, 20013680), (2, 10006840), (4, 5003420), (5, 4002736), (8, 2501710), (10, 2001368), (16, 1250855), (20, 1000684), (23, 870160), (40, 500342), (46, 435080), (73, 274160), (80, 250171), (92, 217540), (115, 174032), (146, 137080), (149, 134320), (184, 108770), (230, 87016), (292, 68540), (298, 67160), (365, 54832), (368, 54385), (460, 43508), (584, 34270), (596, 33580), (730, 27416), (745, 26864), (920, 21754), (1168, 17135), (1192, 16790), (1460, 13708), (1490, 13432), (1679, 11920), (1840, 10877), (2384, 8395), (2920, 6854), (2980, 6716), (3358, 5960), (3427, 5840)]