21398320

素因数分解:

$2^4\times 5^1\times {\mathrm{267479}}^1$

素因数の和:267492

約数の個数: 20

約数和(自身を含む): 49751280

約数和(自身を除く): 28352960

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 267479, 534958, 1069916, 1337395, 2139832, 2674790, 4279664, 5349580, 10699160, 21398320]

約数ペア:

[(1, 21398320), (2, 10699160), (4, 5349580), (5, 4279664), (8, 2674790), (10, 2139832), (16, 1337395), (20, 1069916), (40, 534958), (80, 267479)]