81405140

素因数分解:

$2^2\times 5^1\times {\mathrm{1471}}^1\times {\mathrm{2767}}^1$

素因数の和:4247

約数の個数: 24

約数和(自身を含む): 171128832

約数和(自身を除く): 89723692

約数列:

[1, 2, 4, 5, 10, 20, 1471, 2767, 2942, 5534, 5884, 7355, 11068, 13835, 14710, 27670, 29420, 55340, 4070257, 8140514, 16281028, 20351285, 40702570, 81405140]

約数ペア:

[(1, 81405140), (2, 40702570), (4, 20351285), (5, 16281028), (10, 8140514), (20, 4070257), (1471, 55340), (2767, 29420), (2942, 27670), (5534, 14710), (5884, 13835), (7355, 11068)]