20991860

素因数分解:

$2^2\times 5^1\times {\mathrm{71}}^1\times {\mathrm{14783}}^1$

素因数の和:14863

約数の個数: 24

約数和(自身を含む): 44706816

約数和(自身を除く): 23714956

約数列:

[1, 2, 4, 5, 10, 20, 71, 142, 284, 355, 710, 1420, 14783, 29566, 59132, 73915, 147830, 295660, 1049593, 2099186, 4198372, 5247965, 10495930, 20991860]

約数ペア:

[(1, 20991860), (2, 10495930), (4, 5247965), (5, 4198372), (10, 2099186), (20, 1049593), (71, 295660), (142, 147830), (284, 73915), (355, 59132), (710, 29566), (1420, 14783)]