20402540

素因数分解:

$2^2\times 5^1\times {\mathrm{37}}^1\times {\mathrm{79}}^1\times {\mathrm{349}}^1$

素因数の和:474

約数の個数: 48

約数和(自身を含む): 44688000

約数和(自身を除く): 24285460

約数列:

[1, 2, 4, 5, 10, 20, 37, 74, 79, 148, 158, 185, 316, 349, 370, 395, 698, 740, 790, 1396, 1580, 1745, 2923, 3490, 5846, 6980, 11692, 12913, 14615, 25826, 27571, 29230, 51652, 55142, 58460, 64565, 110284, 129130, 137855, 258260, 275710, 551420, 1020127, 2040254, 4080508, 5100635, 10201270, 20402540]

約数ペア:

[(1, 20402540), (2, 10201270), (4, 5100635), (5, 4080508), (10, 2040254), (20, 1020127), (37, 551420), (74, 275710), (79, 258260), (148, 137855), (158, 129130), (185, 110284), (316, 64565), (349, 58460), (370, 55142), (395, 51652), (698, 29230), (740, 27571), (790, 25826), (1396, 14615), (1580, 12913), (1745, 11692), (2923, 6980), (3490, 5846)]