21125680

素因数分解:

$2^4\times 5^1\times {\mathrm{264071}}^1$

素因数の和:264084

約数の個数: 20

約数和(自身を含む): 49117392

約数和(自身を除く): 27991712

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 264071, 528142, 1056284, 1320355, 2112568, 2640710, 4225136, 5281420, 10562840, 21125680]

約数ペア:

[(1, 21125680), (2, 10562840), (4, 5281420), (5, 4225136), (8, 2640710), (10, 2112568), (16, 1320355), (20, 1056284), (40, 528142), (80, 264071)]