20978279

素因数分解:

$7^1\times {\mathrm{89}}^1\times {\mathrm{151}}^1\times {\mathrm{223}}^1$

素因数の和:470

約数の個数: 16

約数和(自身を含む): 24514560

約数和(自身を除く): 3536281

約数列:

[1, 7, 89, 151, 223, 623, 1057, 1561, 13439, 19847, 33673, 94073, 138929, 235711, 2996897, 20978279]

約数ペア:

[(1, 20978279), (7, 2996897), (89, 235711), (151, 138929), (223, 94073), (623, 33673), (1057, 19847), (1561, 13439)]