21078460

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{81071}}^1$

素因数の和:81093

約数の個数: 24

約数和(自身を含む): 47670336

約数和(自身を除く): 26591876

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 130, 260, 81071, 162142, 324284, 405355, 810710, 1053923, 1621420, 2107846, 4215692, 5269615, 10539230, 21078460]

約数ペア:

[(1, 21078460), (2, 10539230), (4, 5269615), (5, 4215692), (10, 2107846), (13, 1621420), (20, 1053923), (26, 810710), (52, 405355), (65, 324284), (130, 162142), (260, 81071)]