21012020

素因数分解:

$2^2\times 5^1\times {\mathrm{197}}^1\times {\mathrm{5333}}^1$

素因数の和:5539

約数の個数: 24

約数和(自身を含む): 44357544

約数和(自身を除く): 23345524

約数列:

[1, 2, 4, 5, 10, 20, 197, 394, 788, 985, 1970, 3940, 5333, 10666, 21332, 26665, 53330, 106660, 1050601, 2101202, 4202404, 5253005, 10506010, 21012020]

約数ペア:

[(1, 21012020), (2, 10506010), (4, 5253005), (5, 4202404), (10, 2101202), (20, 1050601), (197, 106660), (394, 53330), (788, 26665), (985, 21332), (1970, 10666), (3940, 5333)]