21117980

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{81223}}^1$

素因数の和:81245

約数の個数: 24

約数和(自身を含む): 47759712

約数和(自身を除く): 26641732

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 130, 260, 81223, 162446, 324892, 406115, 812230, 1055899, 1624460, 2111798, 4223596, 5279495, 10558990, 21117980]

約数ペア:

[(1, 21117980), (2, 10558990), (4, 5279495), (5, 4223596), (10, 2111798), (13, 1624460), (20, 1055899), (26, 812230), (52, 406115), (65, 324892), (130, 162446), (260, 81223)]