21261915

素因数分解:

$3^2\times 5^1\times {\mathrm{97}}^1\times {\mathrm{4871}}^1$

素因数の和:4979

約数の個数: 24

約数和(自身を含む): 37241568

約数和(自身を除く): 15979653

約数列:

[1, 3, 5, 9, 15, 45, 97, 291, 485, 873, 1455, 4365, 4871, 14613, 24355, 43839, 73065, 219195, 472487, 1417461, 2362435, 4252383, 7087305, 21261915]

約数ペア:

[(1, 21261915), (3, 7087305), (5, 4252383), (9, 2362435), (15, 1417461), (45, 472487), (97, 219195), (291, 73065), (485, 43839), (873, 24355), (1455, 14613), (4365, 4871)]