20808774

素因数分解:

$2^1\times 3^2\times 7^1\times {\mathrm{239}}^1\times {\mathrm{691}}^1$

素因数の和:945

約数の個数: 48

約数和(自身を含む): 51816960

約数和(自身を除く): 31008186

約数列:

[1, 2, 3, 6, 7, 9, 14, 18, 21, 42, 63, 126, 239, 478, 691, 717, 1382, 1434, 1673, 2073, 2151, 3346, 4146, 4302, 4837, 5019, 6219, 9674, 10038, 12438, 14511, 15057, 29022, 30114, 43533, 87066, 165149, 330298, 495447, 990894, 1156043, 1486341, 2312086, 2972682, 3468129, 6936258, 10404387, 20808774]

約数ペア:

[(1, 20808774), (2, 10404387), (3, 6936258), (6, 3468129), (7, 2972682), (9, 2312086), (14, 1486341), (18, 1156043), (21, 990894), (42, 495447), (63, 330298), (126, 165149), (239, 87066), (478, 43533), (691, 30114), (717, 29022), (1382, 15057), (1434, 14511), (1673, 12438), (2073, 10038), (2151, 9674), (3346, 6219), (4146, 5019), (4302, 4837)]