21438520

素因数分解:

$2^3\times 5^1\times {\mathrm{107}}^1\times {\mathrm{5009}}^1$

素因数の和:5127

約数の個数: 32

約数和(自身を含む): 48697200

約数和(自身を除く): 27258680

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 107, 214, 428, 535, 856, 1070, 2140, 4280, 5009, 10018, 20036, 25045, 40072, 50090, 100180, 200360, 535963, 1071926, 2143852, 2679815, 4287704, 5359630, 10719260, 21438520]

約数ペア:

[(1, 21438520), (2, 10719260), (4, 5359630), (5, 4287704), (8, 2679815), (10, 2143852), (20, 1071926), (40, 535963), (107, 200360), (214, 100180), (428, 50090), (535, 40072), (856, 25045), (1070, 20036), (2140, 10018), (4280, 5009)]