21243215

素因数分解:

$5^1\times 7^2\times {\mathrm{31}}^1\times {\mathrm{2797}}^1$

素因数の和:2847

約数の個数: 24

約数和(自身を含む): 30621312

約数和(自身を除く): 9378097

約数列:

[1, 5, 7, 31, 35, 49, 155, 217, 245, 1085, 1519, 2797, 7595, 13985, 19579, 86707, 97895, 137053, 433535, 606949, 685265, 3034745, 4248643, 21243215]

約数ペア:

[(1, 21243215), (5, 4248643), (7, 3034745), (31, 685265), (35, 606949), (49, 433535), (155, 137053), (217, 97895), (245, 86707), (1085, 19579), (1519, 13985), (2797, 7595)]