21992020

素因数分解:

$2^2\times 5^1\times {\mathrm{31}}^1\times {\mathrm{79}}^1\times {\mathrm{449}}^1$

素因数の和:568

約数の個数: 48

約数和(自身を含む): 48384000

約数和(自身を除く): 26391980

約数列:

[1, 2, 4, 5, 10, 20, 31, 62, 79, 124, 155, 158, 310, 316, 395, 449, 620, 790, 898, 1580, 1796, 2245, 2449, 4490, 4898, 8980, 9796, 12245, 13919, 24490, 27838, 35471, 48980, 55676, 69595, 70942, 139190, 141884, 177355, 278380, 354710, 709420, 1099601, 2199202, 4398404, 5498005, 10996010, 21992020]

約数ペア:

[(1, 21992020), (2, 10996010), (4, 5498005), (5, 4398404), (10, 2199202), (20, 1099601), (31, 709420), (62, 354710), (79, 278380), (124, 177355), (155, 141884), (158, 139190), (310, 70942), (316, 69595), (395, 55676), (449, 48980), (620, 35471), (790, 27838), (898, 24490), (1580, 13919), (1796, 12245), (2245, 9796), (2449, 8980), (4490, 4898)]