20991130

素因数分解:

$2^1\times 5^1\times {\mathrm{251}}^1\times {\mathrm{8363}}^1$

素因数の和:8621

約数の個数: 16

約数和(自身を含む): 37939104

約数和(自身を除く): 16947974

約数列:

[1, 2, 5, 10, 251, 502, 1255, 2510, 8363, 16726, 41815, 83630, 2099113, 4198226, 10495565, 20991130]

約数ペア:

[(1, 20991130), (2, 10495565), (5, 4198226), (10, 2099113), (251, 83630), (502, 41815), (1255, 16726), (2510, 8363)]