21420007

素因数分解:

$7^3\times {\mathrm{197}}^1\times {\mathrm{317}}^1$

素因数の和:535

約数の個数: 16

約数和(自身を含む): 25185600

約数和(自身を除く): 3765593

約数列:

[1, 7, 49, 197, 317, 343, 1379, 2219, 9653, 15533, 62449, 67571, 108731, 437143, 3060001, 21420007]

約数ペア:

[(1, 21420007), (7, 3060001), (49, 437143), (197, 108731), (317, 67571), (343, 62449), (1379, 15533), (2219, 9653)]