21015005

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{181}}^1\times {\mathrm{2111}}^1$

素因数の和:2308

約数の個数: 16

約数和(自身を含む): 27675648

約数和(自身を除く): 6660643

約数列:

[1, 5, 11, 55, 181, 905, 1991, 2111, 9955, 10555, 23221, 116105, 382091, 1910455, 4203001, 21015005]

約数ペア:

[(1, 21015005), (5, 4203001), (11, 1910455), (55, 382091), (181, 116105), (905, 23221), (1991, 10555), (2111, 9955)]