20901560

素因数分解:

$2^3\times 5^1\times {\mathrm{97}}^1\times {\mathrm{5387}}^1$

素因数の和:5495

約数の個数: 32

約数和(自身を含む): 47522160

約数和(自身を除く): 26620600

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 97, 194, 388, 485, 776, 970, 1940, 3880, 5387, 10774, 21548, 26935, 43096, 53870, 107740, 215480, 522539, 1045078, 2090156, 2612695, 4180312, 5225390, 10450780, 20901560]

約数ペア:

[(1, 20901560), (2, 10450780), (4, 5225390), (5, 4180312), (8, 2612695), (10, 2090156), (20, 1045078), (40, 522539), (97, 215480), (194, 107740), (388, 53870), (485, 43096), (776, 26935), (970, 21548), (1940, 10774), (3880, 5387)]