21490885

素因数分解:

$5^1\times {\mathrm{13}}^2\times {\mathrm{29}}^1\times {\mathrm{877}}^1$

素因数の和:937

約数の個数: 24

約数和(自身を含む): 28921320

約数和(自身を除く): 7430435

約数列:

[1, 5, 13, 29, 65, 145, 169, 377, 845, 877, 1885, 4385, 4901, 11401, 24505, 25433, 57005, 127165, 148213, 330629, 741065, 1653145, 4298177, 21490885]

約数ペア:

[(1, 21490885), (5, 4298177), (13, 1653145), (29, 741065), (65, 330629), (145, 148213), (169, 127165), (377, 57005), (845, 25433), (877, 24505), (1885, 11401), (4385, 4901)]