21201985

素因数分解:

$5^1\times 7^1\times {\mathrm{31}}^1\times {\mathrm{19541}}^1$

素因数の和:19584

約数の個数: 16

約数和(自身を含む): 30016512

約数和(自身を除く): 8814527

約数列:

[1, 5, 7, 31, 35, 155, 217, 1085, 19541, 97705, 136787, 605771, 683935, 3028855, 4240397, 21201985]

約数ペア:

[(1, 21201985), (5, 4240397), (7, 3028855), (31, 683935), (35, 605771), (155, 136787), (217, 97705), (1085, 19541)]