81605680

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{78467}}^1$

素因数の和:78493

約数の個数: 40

約数和(自身を含む): 204330672

約数和(自身を除く): 122724992

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 104, 130, 208, 260, 520, 1040, 78467, 156934, 313868, 392335, 627736, 784670, 1020071, 1255472, 1569340, 2040142, 3138680, 4080284, 5100355, 6277360, 8160568, 10200710, 16321136, 20401420, 40802840, 81605680]

約数ペア:

[(1, 81605680), (2, 40802840), (4, 20401420), (5, 16321136), (8, 10200710), (10, 8160568), (13, 6277360), (16, 5100355), (20, 4080284), (26, 3138680), (40, 2040142), (52, 1569340), (65, 1255472), (80, 1020071), (104, 784670), (130, 627736), (208, 392335), (260, 313868), (520, 156934), (1040, 78467)]