21519999

素因数分解:

$3^4\times {\mathrm{379}}^1\times {\mathrm{701}}^1$

素因数の和:1092

約数の個数: 20

約数和(自身を含む): 32277960

約数和(自身を除く): 10757961

約数列:

[1, 3, 9, 27, 81, 379, 701, 1137, 2103, 3411, 6309, 10233, 18927, 30699, 56781, 265679, 797037, 2391111, 7173333, 21519999]

約数ペア:

[(1, 21519999), (3, 7173333), (9, 2391111), (27, 797037), (81, 265679), (379, 56781), (701, 30699), (1137, 18927), (2103, 10233), (3411, 6309)]