21396851

素因数分解:

$7^1\times {\mathrm{31}}^1\times {\mathrm{151}}^1\times {\mathrm{653}}^1$

素因数の和:842

約数の個数: 16

約数和(自身を含む): 25448448

約数和(自身を除く): 4051597

約数列:

[1, 7, 31, 151, 217, 653, 1057, 4571, 4681, 20243, 32767, 98603, 141701, 690221, 3056693, 21396851]

約数ペア:

[(1, 21396851), (7, 3056693), (31, 690221), (151, 141701), (217, 98603), (653, 32767), (1057, 20243), (4571, 4681)]