21300080

素因数分解:

$2^4\times 5^1\times {\mathrm{181}}^1\times {\mathrm{1471}}^1$

素因数の和:1665

約数の個数: 40

約数和(自身を含む): 49830144

約数和(自身を除く): 28530064

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 181, 362, 724, 905, 1448, 1471, 1810, 2896, 2942, 3620, 5884, 7240, 7355, 11768, 14480, 14710, 23536, 29420, 58840, 117680, 266251, 532502, 1065004, 1331255, 2130008, 2662510, 4260016, 5325020, 10650040, 21300080]

約数ペア:

[(1, 21300080), (2, 10650040), (4, 5325020), (5, 4260016), (8, 2662510), (10, 2130008), (16, 1331255), (20, 1065004), (40, 532502), (80, 266251), (181, 117680), (362, 58840), (724, 29420), (905, 23536), (1448, 14710), (1471, 14480), (1810, 11768), (2896, 7355), (2942, 7240), (3620, 5884)]