81421580

素因数分解:

$2^2\times 5^1\times {\mathrm{61}}^1\times {\mathrm{66739}}^1$

素因数の和:66809

約数の個数: 24

約数和(自身を含む): 173790960

約数和(自身を除く): 92369380

約数列:

[1, 2, 4, 5, 10, 20, 61, 122, 244, 305, 610, 1220, 66739, 133478, 266956, 333695, 667390, 1334780, 4071079, 8142158, 16284316, 20355395, 40710790, 81421580]

約数ペア:

[(1, 81421580), (2, 40710790), (4, 20355395), (5, 16284316), (10, 8142158), (20, 4071079), (61, 1334780), (122, 667390), (244, 333695), (305, 266956), (610, 133478), (1220, 66739)]