21263420

素因数分解:

$2^2\times 5^1\times {\mathrm{41}}^1\times {\mathrm{25931}}^1$

素因数の和:25981

約数の個数: 24

約数和(自身を含む): 45744048

約数和(自身を除く): 24480628

約数列:

[1, 2, 4, 5, 10, 20, 41, 82, 164, 205, 410, 820, 25931, 51862, 103724, 129655, 259310, 518620, 1063171, 2126342, 4252684, 5315855, 10631710, 21263420]

約数ペア:

[(1, 21263420), (2, 10631710), (4, 5315855), (5, 4252684), (10, 2126342), (20, 1063171), (41, 518620), (82, 259310), (164, 129655), (205, 103724), (410, 51862), (820, 25931)]