21287408

素因数分解:

$2^4\times {\mathrm{43}}^1\times {\mathrm{30941}}^1$

素因数の和:30992

約数の個数: 20

約数和(自身を含む): 42204888

約数和(自身を除く): 20917480

約数列:

[1, 2, 4, 8, 16, 43, 86, 172, 344, 688, 30941, 61882, 123764, 247528, 495056, 1330463, 2660926, 5321852, 10643704, 21287408]

約数ペア:

[(1, 21287408), (2, 10643704), (4, 5321852), (8, 2660926), (16, 1330463), (43, 495056), (86, 247528), (172, 123764), (344, 61882), (688, 30941)]