21516145

素因数分解:

$5^1\times 7^2\times {\mathrm{53}}^1\times {\mathrm{1657}}^1$

素因数の和:1729

約数の個数: 24

約数和(自身を含む): 30619944

約数和(自身を除く): 9103799

約数列:

[1, 5, 7, 35, 49, 53, 245, 265, 371, 1657, 1855, 2597, 8285, 11599, 12985, 57995, 81193, 87821, 405965, 439105, 614747, 3073735, 4303229, 21516145]

約数ペア:

[(1, 21516145), (5, 4303229), (7, 3073735), (35, 614747), (49, 439105), (53, 405965), (245, 87821), (265, 81193), (371, 57995), (1657, 12985), (1855, 11599), (2597, 8285)]