21656720

素因数分解:

$2^4\times 5^1\times {\mathrm{270709}}^1$

素因数の和:270722

約数の個数: 20

約数和(自身を含む): 50352060

約数和(自身を除く): 28695340

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 270709, 541418, 1082836, 1353545, 2165672, 2707090, 4331344, 5414180, 10828360, 21656720]

約数ペア:

[(1, 21656720), (2, 10828360), (4, 5414180), (5, 4331344), (8, 2707090), (10, 2165672), (16, 1353545), (20, 1082836), (40, 541418), (80, 270709)]