20999315

素因数分解:

$5^1\times {\mathrm{71}}^1\times {\mathrm{149}}^1\times {\mathrm{397}}^1$

素因数の和:622

約数の個数: 16

約数和(自身を含む): 25790400

約数和(自身を除く): 4791085

約数列:

[1, 5, 71, 149, 355, 397, 745, 1985, 10579, 28187, 52895, 59153, 140935, 295765, 4199863, 20999315]

約数ペア:

[(1, 20999315), (5, 4199863), (71, 295765), (149, 140935), (355, 59153), (397, 52895), (745, 28187), (1985, 10579)]