20640711

素因数分解:

$3^1\times 7^3\times {\mathrm{13}}^1\times {\mathrm{1543}}^1$

素因数の和:1580

約数の個数: 32

約数和(自身を含む): 34585600

約数和(自身を除く): 13944889

約数列:

[1, 3, 7, 13, 21, 39, 49, 91, 147, 273, 343, 637, 1029, 1543, 1911, 4459, 4629, 10801, 13377, 20059, 32403, 60177, 75607, 140413, 226821, 421239, 529249, 982891, 1587747, 2948673, 6880237, 20640711]

約数ペア:

[(1, 20640711), (3, 6880237), (7, 2948673), (13, 1587747), (21, 982891), (39, 529249), (49, 421239), (91, 226821), (147, 140413), (273, 75607), (343, 60177), (637, 32403), (1029, 20059), (1543, 13377), (1911, 10801), (4459, 4629)]