21991216

素因数分解:

$2^4\times {\mathrm{13}}^1\times {\mathrm{105727}}^1$

素因数の和:105748

約数の個数: 20

約数和(自身を含む): 45885952

約数和(自身を除く): 23894736

約数列:

[1, 2, 4, 8, 13, 16, 26, 52, 104, 208, 105727, 211454, 422908, 845816, 1374451, 1691632, 2748902, 5497804, 10995608, 21991216]

約数ペア:

[(1, 21991216), (2, 10995608), (4, 5497804), (8, 2748902), (13, 1691632), (16, 1374451), (26, 845816), (52, 422908), (104, 211454), (208, 105727)]