19987748

素因数分解:

$2^2\times {\mathrm{11}}^2\times {\mathrm{61}}^1\times {\mathrm{677}}^1$

素因数の和:764

約数の個数: 36

約数和(自身を含む): 39135516

約数和(自身を除く): 19147768

約数列:

[1, 2, 4, 11, 22, 44, 61, 121, 122, 242, 244, 484, 671, 677, 1342, 1354, 2684, 2708, 7381, 7447, 14762, 14894, 29524, 29788, 41297, 81917, 82594, 163834, 165188, 327668, 454267, 908534, 1817068, 4996937, 9993874, 19987748]

約数ペア:

[(1, 19987748), (2, 9993874), (4, 4996937), (11, 1817068), (22, 908534), (44, 454267), (61, 327668), (121, 165188), (122, 163834), (242, 82594), (244, 81917), (484, 41297), (671, 29788), (677, 29524), (1342, 14894), (1354, 14762), (2684, 7447), (2708, 7381)]