21720430

素因数分解:

$2^1\times 5^1\times {\mathrm{109}}^1\times {\mathrm{19927}}^1$

素因数の和:20043

約数の個数: 16

約数和(自身を含む): 39457440

約数和(自身を除く): 17737010

約数列:

[1, 2, 5, 10, 109, 218, 545, 1090, 19927, 39854, 99635, 199270, 2172043, 4344086, 10860215, 21720430]

約数ペア:

[(1, 21720430), (2, 10860215), (5, 4344086), (10, 2172043), (109, 199270), (218, 99635), (545, 39854), (1090, 19927)]