21172225

素因数分解:

$5^2\times {\mathrm{17}}^1\times {\mathrm{31}}^1\times {\mathrm{1607}}^1$

素因数の和:1665

約数の個数: 24

約数和(自身を含む): 28712448

約数和(自身を除く): 7540223

約数列:

[1, 5, 17, 25, 31, 85, 155, 425, 527, 775, 1607, 2635, 8035, 13175, 27319, 40175, 49817, 136595, 249085, 682975, 846889, 1245425, 4234445, 21172225]

約数ペア:

[(1, 21172225), (5, 4234445), (17, 1245425), (25, 846889), (31, 682975), (85, 249085), (155, 136595), (425, 49817), (527, 40175), (775, 27319), (1607, 13175), (2635, 8035)]