20406981

素因数分解:

$3^1\times 7^2\times {\mathrm{29}}^1\times {\mathrm{4787}}^1$

素因数の和:4833

約数の個数: 24

約数和(自身を含む): 32749920

約数和(自身を除く): 12342939

約数列:

[1, 3, 7, 21, 29, 49, 87, 147, 203, 609, 1421, 4263, 4787, 14361, 33509, 100527, 138823, 234563, 416469, 703689, 971761, 2915283, 6802327, 20406981]

約数ペア:

[(1, 20406981), (3, 6802327), (7, 2915283), (21, 971761), (29, 703689), (49, 416469), (87, 234563), (147, 138823), (203, 100527), (609, 33509), (1421, 14361), (4263, 4787)]