20278360

素因数分解:

$2^3\times 5^1\times {\mathrm{109}}^1\times {\mathrm{4651}}^1$

素因数の和:4771

約数の個数: 32

約数和(自身を含む): 46054800

約数和(自身を除く): 25776440

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 109, 218, 436, 545, 872, 1090, 2180, 4360, 4651, 9302, 18604, 23255, 37208, 46510, 93020, 186040, 506959, 1013918, 2027836, 2534795, 4055672, 5069590, 10139180, 20278360]

約数ペア:

[(1, 20278360), (2, 10139180), (4, 5069590), (5, 4055672), (8, 2534795), (10, 2027836), (20, 1013918), (40, 506959), (109, 186040), (218, 93020), (436, 46510), (545, 37208), (872, 23255), (1090, 18604), (2180, 9302), (4360, 4651)]