20821480

素因数分解:

$2^3\times 5^1\times {\mathrm{211}}^1\times {\mathrm{2467}}^1$

素因数の和:2689

約数の個数: 32

約数和(自身を含む): 47089440

約数和(自身を除く): 26267960

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 211, 422, 844, 1055, 1688, 2110, 2467, 4220, 4934, 8440, 9868, 12335, 19736, 24670, 49340, 98680, 520537, 1041074, 2082148, 2602685, 4164296, 5205370, 10410740, 20821480]

約数ペア:

[(1, 20821480), (2, 10410740), (4, 5205370), (5, 4164296), (8, 2602685), (10, 2082148), (20, 1041074), (40, 520537), (211, 98680), (422, 49340), (844, 24670), (1055, 19736), (1688, 12335), (2110, 9868), (2467, 8440), (4220, 4934)]