21228955

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{31}}^1\times {\mathrm{12451}}^1$

素因数の和:12498

約数の個数: 16

約数和(自身を含む): 28689408

約数和(自身を除く): 7460453

約数列:

[1, 5, 11, 31, 55, 155, 341, 1705, 12451, 62255, 136961, 385981, 684805, 1929905, 4245791, 21228955]

約数ペア:

[(1, 21228955), (5, 4245791), (11, 1929905), (31, 684805), (55, 385981), (155, 136961), (341, 62255), (1705, 12451)]