25128440

素因数分解:

$2^3\times 5^1\times {\mathrm{643}}^1\times {\mathrm{977}}^1$

素因数の和:1631

約数の個数: 32

約数和(自身を含む): 56684880

約数和(自身を除く): 31556440

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 643, 977, 1286, 1954, 2572, 3215, 3908, 4885, 5144, 6430, 7816, 9770, 12860, 19540, 25720, 39080, 628211, 1256422, 2512844, 3141055, 5025688, 6282110, 12564220, 25128440]

約数ペア:

[(1, 25128440), (2, 12564220), (4, 6282110), (5, 5025688), (8, 3141055), (10, 2512844), (20, 1256422), (40, 628211), (643, 39080), (977, 25720), (1286, 19540), (1954, 12860), (2572, 9770), (3215, 7816), (3908, 6430), (4885, 5144)]