20257640

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{163}}^1\times {\mathrm{239}}^1$

素因数の和:426

約数の個数: 64

約数和(自身を含む): 49593600

約数和(自身を除く): 29335960

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 52, 65, 104, 130, 163, 239, 260, 326, 478, 520, 652, 815, 956, 1195, 1304, 1630, 1912, 2119, 2390, 3107, 3260, 4238, 4780, 6214, 6520, 8476, 9560, 10595, 12428, 15535, 16952, 21190, 24856, 31070, 38957, 42380, 62140, 77914, 84760, 124280, 155828, 194785, 311656, 389570, 506441, 779140, 1012882, 1558280, 2025764, 2532205, 4051528, 5064410, 10128820, 20257640]

約数ペア:

[(1, 20257640), (2, 10128820), (4, 5064410), (5, 4051528), (8, 2532205), (10, 2025764), (13, 1558280), (20, 1012882), (26, 779140), (40, 506441), (52, 389570), (65, 311656), (104, 194785), (130, 155828), (163, 124280), (239, 84760), (260, 77914), (326, 62140), (478, 42380), (520, 38957), (652, 31070), (815, 24856), (956, 21190), (1195, 16952), (1304, 15535), (1630, 12428), (1912, 10595), (2119, 9560), (2390, 8476), (3107, 6520), (3260, 6214), (4238, 4780)]