21248680

素因数分解:

$2^3\times 5^1\times {\mathrm{163}}^1\times {\mathrm{3259}}^1$

素因数の和:3433

約数の個数: 32

約数和(自身を含む): 48117600

約数和(自身を除く): 26868920

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 163, 326, 652, 815, 1304, 1630, 3259, 3260, 6518, 6520, 13036, 16295, 26072, 32590, 65180, 130360, 531217, 1062434, 2124868, 2656085, 4249736, 5312170, 10624340, 21248680]

約数ペア:

[(1, 21248680), (2, 10624340), (4, 5312170), (5, 4249736), (8, 2656085), (10, 2124868), (20, 1062434), (40, 531217), (163, 130360), (326, 65180), (652, 32590), (815, 26072), (1304, 16295), (1630, 13036), (3259, 6520), (3260, 6518)]