21086840

素因数分解:

$2^3\times 5^1\times {\mathrm{317}}^1\times {\mathrm{1663}}^1$

素因数の和:1991

約数の個数: 32

約数和(自身を含む): 47623680

約数和(自身を除く): 26536840

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 317, 634, 1268, 1585, 1663, 2536, 3170, 3326, 6340, 6652, 8315, 12680, 13304, 16630, 33260, 66520, 527171, 1054342, 2108684, 2635855, 4217368, 5271710, 10543420, 21086840]

約数ペア:

[(1, 21086840), (2, 10543420), (4, 5271710), (5, 4217368), (8, 2635855), (10, 2108684), (20, 1054342), (40, 527171), (317, 66520), (634, 33260), (1268, 16630), (1585, 13304), (1663, 12680), (2536, 8315), (3170, 6652), (3326, 6340)]