21253779

素因数分解:

$3^3\times {\mathrm{71}}^1\times {\mathrm{11087}}^1$

素因数の和:11167

約数の個数: 16

約数和(自身を含む): 31933440

約数和(自身を除く): 10679661

約数列:

[1, 3, 9, 27, 71, 213, 639, 1917, 11087, 33261, 99783, 299349, 787177, 2361531, 7084593, 21253779]

約数ペア:

[(1, 21253779), (3, 7084593), (9, 2361531), (27, 787177), (71, 299349), (213, 99783), (639, 33261), (1917, 11087)]