20851831

素因数分解:

$7^1\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{37}}^1\times {\mathrm{563}}^1$

素因数の和:631

約数の個数: 32

約数和(自身を含む): 28804608

約数和(自身を除く): 7952777

約数列:

[1, 7, 11, 13, 37, 77, 91, 143, 259, 407, 481, 563, 1001, 2849, 3367, 3941, 5291, 6193, 7319, 20831, 37037, 43351, 51233, 80509, 145817, 229141, 270803, 563563, 1603987, 1895621, 2978833, 20851831]

約数ペア:

[(1, 20851831), (7, 2978833), (11, 1895621), (13, 1603987), (37, 563563), (77, 270803), (91, 229141), (143, 145817), (259, 80509), (407, 51233), (481, 43351), (563, 37037), (1001, 20831), (2849, 7319), (3367, 6193), (3941, 5291)]