21890390

素因数分解:

$2^1\times 5^1\times {\mathrm{17}}^1\times {\mathrm{128767}}^1$

素因数の和:128791

約数の個数: 16

約数和(自身を含む): 41720832

約数和(自身を除く): 19830442

約数列:

[1, 2, 5, 10, 17, 34, 85, 170, 128767, 257534, 643835, 1287670, 2189039, 4378078, 10945195, 21890390]

約数ペア:

[(1, 21890390), (2, 10945195), (5, 4378078), (10, 2189039), (17, 1287670), (34, 643835), (85, 257534), (170, 128767)]