320393980

素因数分解:

$2^2\times 5^1\times {\mathrm{79}}^1\times {\mathrm{199}}^1\times {\mathrm{1019}}^1$

素因数の和:1306

約数の個数: 48

約数和(自身を含む): 685440000

約数和(自身を除く): 365046020

約数列:

[1, 2, 4, 5, 10, 20, 79, 158, 199, 316, 395, 398, 790, 796, 995, 1019, 1580, 1990, 2038, 3980, 4076, 5095, 10190, 15721, 20380, 31442, 62884, 78605, 80501, 157210, 161002, 202781, 314420, 322004, 402505, 405562, 805010, 811124, 1013905, 1610020, 2027810, 4055620, 16019699, 32039398, 64078796, 80098495, 160196990, 320393980]

約数ペア:

[(1, 320393980), (2, 160196990), (4, 80098495), (5, 64078796), (10, 32039398), (20, 16019699), (79, 4055620), (158, 2027810), (199, 1610020), (316, 1013905), (395, 811124), (398, 805010), (790, 405562), (796, 402505), (995, 322004), (1019, 314420), (1580, 202781), (1990, 161002), (2038, 157210), (3980, 80501), (4076, 78605), (5095, 62884), (10190, 31442), (15721, 20380)]