21416815

素因数分解:

$5^1\times 7^1\times {\mathrm{31}}^1\times {\mathrm{19739}}^1$

素因数の和:19782

約数の個数: 16

約数和(自身を含む): 30320640

約数和(自身を除く): 8903825

約数列:

[1, 5, 7, 31, 35, 155, 217, 1085, 19739, 98695, 138173, 611909, 690865, 3059545, 4283363, 21416815]

約数ペア:

[(1, 21416815), (5, 4283363), (7, 3059545), (31, 690865), (35, 611909), (155, 138173), (217, 98695), (1085, 19739)]