19781564

素因数分解:

$2^2\times {\mathrm{11}}^2\times {\mathrm{23}}^1\times {\mathrm{1777}}^1$

素因数の和:1826

約数の個数: 36

約数和(自身を含む): 39727632

約数和(自身を除く): 19946068

約数列:

[1, 2, 4, 11, 22, 23, 44, 46, 92, 121, 242, 253, 484, 506, 1012, 1777, 2783, 3554, 5566, 7108, 11132, 19547, 39094, 40871, 78188, 81742, 163484, 215017, 430034, 449581, 860068, 899162, 1798324, 4945391, 9890782, 19781564]

約数ペア:

[(1, 19781564), (2, 9890782), (4, 4945391), (11, 1798324), (22, 899162), (23, 860068), (44, 449581), (46, 430034), (92, 215017), (121, 163484), (242, 81742), (253, 78188), (484, 40871), (506, 39094), (1012, 19547), (1777, 11132), (2783, 7108), (3554, 5566)]