21421985

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{139}}^1\times {\mathrm{2371}}^1$

素因数の和:2528

約数の個数: 16

約数和(自身を含む): 27894720

約数和(自身を除く): 6472735

約数列:

[1, 5, 13, 65, 139, 695, 1807, 2371, 9035, 11855, 30823, 154115, 329569, 1647845, 4284397, 21421985]

約数ペア:

[(1, 21421985), (5, 4284397), (13, 1647845), (65, 329569), (139, 154115), (695, 30823), (1807, 11855), (2371, 9035)]