25642840

素因数分解:

$2^3\times 5^1\times {\mathrm{643}}^1\times {\mathrm{997}}^1$

素因数の和:1651

約数の個数: 32

約数和(自身を含む): 57844080

約数和(自身を除く): 32201240

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 643, 997, 1286, 1994, 2572, 3215, 3988, 4985, 5144, 6430, 7976, 9970, 12860, 19940, 25720, 39880, 641071, 1282142, 2564284, 3205355, 5128568, 6410710, 12821420, 25642840]

約数ペア:

[(1, 25642840), (2, 12821420), (4, 6410710), (5, 5128568), (8, 3205355), (10, 2564284), (20, 1282142), (40, 641071), (643, 39880), (997, 25720), (1286, 19940), (1994, 12860), (2572, 9970), (3215, 7976), (3988, 6430), (4985, 5144)]