21241240

素因数分解:

$2^3\times 5^1\times {\mathrm{19}}^2\times {\mathrm{1471}}^1$

素因数の和:1520

約数の個数: 48

約数和(自身を含む): 50474880

約数和(自身を除く): 29233640

約数列:

[1, 2, 4, 5, 8, 10, 19, 20, 38, 40, 76, 95, 152, 190, 361, 380, 722, 760, 1444, 1471, 1805, 2888, 2942, 3610, 5884, 7220, 7355, 11768, 14440, 14710, 27949, 29420, 55898, 58840, 111796, 139745, 223592, 279490, 531031, 558980, 1062062, 1117960, 2124124, 2655155, 4248248, 5310310, 10620620, 21241240]

約数ペア:

[(1, 21241240), (2, 10620620), (4, 5310310), (5, 4248248), (8, 2655155), (10, 2124124), (19, 1117960), (20, 1062062), (38, 558980), (40, 531031), (76, 279490), (95, 223592), (152, 139745), (190, 111796), (361, 58840), (380, 55898), (722, 29420), (760, 27949), (1444, 14710), (1471, 14440), (1805, 11768), (2888, 7355), (2942, 7220), (3610, 5884)]