21515985

素因数分解:

$3^2\times 5^1\times {\mathrm{647}}^1\times {\mathrm{739}}^1$

素因数の和:1397

約数の個数: 24

約数和(自身を含む): 37402560

約数和(自身を除く): 15886575

約数列:

[1, 3, 5, 9, 15, 45, 647, 739, 1941, 2217, 3235, 3695, 5823, 6651, 9705, 11085, 29115, 33255, 478133, 1434399, 2390665, 4303197, 7171995, 21515985]

約数ペア:

[(1, 21515985), (3, 7171995), (5, 4303197), (9, 2390665), (15, 1434399), (45, 478133), (647, 33255), (739, 29115), (1941, 11085), (2217, 9705), (3235, 6651), (3695, 5823)]