21531515

素因数分解:

$5^1\times {\mathrm{31}}^1\times {\mathrm{53}}^1\times {\mathrm{2621}}^1$

素因数の和:2710

約数の個数: 16

約数和(自身を含む): 27184896

約数和(自身を除く): 5653381

約数列:

[1, 5, 31, 53, 155, 265, 1643, 2621, 8215, 13105, 81251, 138913, 406255, 694565, 4306303, 21531515]

約数ペア:

[(1, 21531515), (5, 4306303), (31, 694565), (53, 406255), (155, 138913), (265, 81251), (1643, 13105), (2621, 8215)]