15781420

素因数分解:

$2^2\times 5^1\times {\mathrm{641}}^1\times {\mathrm{1231}}^1$

素因数の和:1881

約数の個数: 24

約数和(自身を含む): 33219648

約数和(自身を除く): 17438228

約数列:

[1, 2, 4, 5, 10, 20, 641, 1231, 1282, 2462, 2564, 3205, 4924, 6155, 6410, 12310, 12820, 24620, 789071, 1578142, 3156284, 3945355, 7890710, 15781420]

約数ペア:

[(1, 15781420), (2, 7890710), (4, 3945355), (5, 3156284), (10, 1578142), (20, 789071), (641, 24620), (1231, 12820), (1282, 12310), (2462, 6410), (2564, 6155), (3205, 4924)]