20991145

素因数分解:

$5^1\times 7^1\times {\mathrm{353}}^1\times {\mathrm{1699}}^1$

素因数の和:2064

約数の個数: 16

約数和(自身を含む): 28886400

約数和(自身を除く): 7895255

約数列:

[1, 5, 7, 35, 353, 1699, 1765, 2471, 8495, 11893, 12355, 59465, 599747, 2998735, 4198229, 20991145]

約数ペア:

[(1, 20991145), (5, 4198229), (7, 2998735), (35, 599747), (353, 59465), (1699, 12355), (1765, 11893), (2471, 8495)]