21193960

素因数分解:

$2^3\times 5^1\times {\mathrm{109}}^1\times {\mathrm{4861}}^1$

素因数の和:4981

約数の個数: 32

約数和(自身を含む): 48133800

約数和(自身を除く): 26939840

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 109, 218, 436, 545, 872, 1090, 2180, 4360, 4861, 9722, 19444, 24305, 38888, 48610, 97220, 194440, 529849, 1059698, 2119396, 2649245, 4238792, 5298490, 10596980, 21193960]

約数ペア:

[(1, 21193960), (2, 10596980), (4, 5298490), (5, 4238792), (8, 2649245), (10, 2119396), (20, 1059698), (40, 529849), (109, 194440), (218, 97220), (436, 48610), (545, 38888), (872, 24305), (1090, 19444), (2180, 9722), (4360, 4861)]