20640760

素因数分解:

$2^3\times 5^1\times 7^2\times {\mathrm{10531}}^1$

素因数の和:10556

約数の個数: 48

約数和(自身を含む): 54029160

約数和(自身を除く): 33388400

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 49, 56, 70, 98, 140, 196, 245, 280, 392, 490, 980, 1960, 10531, 21062, 42124, 52655, 73717, 84248, 105310, 147434, 210620, 294868, 368585, 421240, 516019, 589736, 737170, 1032038, 1474340, 2064076, 2580095, 2948680, 4128152, 5160190, 10320380, 20640760]

約数ペア:

[(1, 20640760), (2, 10320380), (4, 5160190), (5, 4128152), (7, 2948680), (8, 2580095), (10, 2064076), (14, 1474340), (20, 1032038), (28, 737170), (35, 589736), (40, 516019), (49, 421240), (56, 368585), (70, 294868), (98, 210620), (140, 147434), (196, 105310), (245, 84248), (280, 73717), (392, 52655), (490, 42124), (980, 21062), (1960, 10531)]