20656220

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{53}}^1\times {\mathrm{1499}}^1$

素因数の和:1574

約数の個数: 48

約数和(自身を含む): 47628000

約数和(自身を除く): 26971780

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 53, 65, 106, 130, 212, 260, 265, 530, 689, 1060, 1378, 1499, 2756, 2998, 3445, 5996, 6890, 7495, 13780, 14990, 19487, 29980, 38974, 77948, 79447, 97435, 158894, 194870, 317788, 389740, 397235, 794470, 1032811, 1588940, 2065622, 4131244, 5164055, 10328110, 20656220]

約数ペア:

[(1, 20656220), (2, 10328110), (4, 5164055), (5, 4131244), (10, 2065622), (13, 1588940), (20, 1032811), (26, 794470), (52, 397235), (53, 389740), (65, 317788), (106, 194870), (130, 158894), (212, 97435), (260, 79447), (265, 77948), (530, 38974), (689, 29980), (1060, 19487), (1378, 14990), (1499, 13780), (2756, 7495), (2998, 6890), (3445, 5996)]