20209840

素因数分解:

$2^4\times 5^1\times 7^1\times {\mathrm{151}}^1\times {\mathrm{239}}^1$

素因数の和:410

約数の個数: 80

約数和(自身を含む): 54282240

約数和(自身を除く): 34072400

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 28, 35, 40, 56, 70, 80, 112, 140, 151, 239, 280, 302, 478, 560, 604, 755, 956, 1057, 1195, 1208, 1510, 1673, 1912, 2114, 2390, 2416, 3020, 3346, 3824, 4228, 4780, 5285, 6040, 6692, 8365, 8456, 9560, 10570, 12080, 13384, 16730, 16912, 19120, 21140, 26768, 33460, 36089, 42280, 66920, 72178, 84560, 133840, 144356, 180445, 252623, 288712, 360890, 505246, 577424, 721780, 1010492, 1263115, 1443560, 2020984, 2526230, 2887120, 4041968, 5052460, 10104920, 20209840]

約数ペア:

[(1, 20209840), (2, 10104920), (4, 5052460), (5, 4041968), (7, 2887120), (8, 2526230), (10, 2020984), (14, 1443560), (16, 1263115), (20, 1010492), (28, 721780), (35, 577424), (40, 505246), (56, 360890), (70, 288712), (80, 252623), (112, 180445), (140, 144356), (151, 133840), (239, 84560), (280, 72178), (302, 66920), (478, 42280), (560, 36089), (604, 33460), (755, 26768), (956, 21140), (1057, 19120), (1195, 16912), (1208, 16730), (1510, 13384), (1673, 12080), (1912, 10570), (2114, 9560), (2390, 8456), (2416, 8365), (3020, 6692), (3346, 6040), (3824, 5285), (4228, 4780)]