21791605

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{31}}^1\times {\mathrm{12781}}^1$

素因数の和:12828

約数の個数: 16

約数和(自身を含む): 29449728

約数和(自身を除く): 7658123

約数列:

[1, 5, 11, 31, 55, 155, 341, 1705, 12781, 63905, 140591, 396211, 702955, 1981055, 4358321, 21791605]

約数ペア:

[(1, 21791605), (5, 4358321), (11, 1981055), (31, 702955), (55, 396211), (155, 140591), (341, 63905), (1705, 12781)]