21291255

素因数分解:

$3^4\times 5^1\times {\mathrm{52571}}^1$

素因数の和:52588

約数の個数: 20

約数和(自身を含む): 38167272

約数和(自身を除く): 16876017

約数列:

[1, 3, 5, 9, 15, 27, 45, 81, 135, 405, 52571, 157713, 262855, 473139, 788565, 1419417, 2365695, 4258251, 7097085, 21291255]

約数ペア:

[(1, 21291255), (3, 7097085), (5, 4258251), (9, 2365695), (15, 1419417), (27, 788565), (45, 473139), (81, 262855), (135, 157713), (405, 52571)]