12821420

素因数分解:

$2^2\times 5^1\times {\mathrm{643}}^1\times {\mathrm{997}}^1$

素因数の和:1649

約数の個数: 24

約数和(自身を含む): 26993904

約数和(自身を除く): 14172484

約数列:

[1, 2, 4, 5, 10, 20, 643, 997, 1286, 1994, 2572, 3215, 3988, 4985, 6430, 9970, 12860, 19940, 641071, 1282142, 2564284, 3205355, 6410710, 12821420]

約数ペア:

[(1, 12821420), (2, 6410710), (4, 3205355), (5, 2564284), (10, 1282142), (20, 641071), (643, 19940), (997, 12860), (1286, 9970), (1994, 6430), (2572, 4985), (3215, 3988)]