21820720

素因数分解:

$2^4\times 5^1\times {\mathrm{272759}}^1$

素因数の和:272772

約数の個数: 20

約数和(自身を含む): 50733360

約数和(自身を除く): 28912640

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 272759, 545518, 1091036, 1363795, 2182072, 2727590, 4364144, 5455180, 10910360, 21820720]

約数ペア:

[(1, 21820720), (2, 10910360), (4, 5455180), (5, 4364144), (8, 2727590), (10, 2182072), (16, 1363795), (20, 1091036), (40, 545518), (80, 272759)]