20540720

素因数分解:

$2^4\times 5^1\times {\mathrm{97}}^1\times {\mathrm{2647}}^1$

素因数の和:2757

約数の個数: 40

約数和(自身を含む): 48267744

約数和(自身を除く): 27727024

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 97, 194, 388, 485, 776, 970, 1552, 1940, 2647, 3880, 5294, 7760, 10588, 13235, 21176, 26470, 42352, 52940, 105880, 211760, 256759, 513518, 1027036, 1283795, 2054072, 2567590, 4108144, 5135180, 10270360, 20540720]

約数ペア:

[(1, 20540720), (2, 10270360), (4, 5135180), (5, 4108144), (8, 2567590), (10, 2054072), (16, 1283795), (20, 1027036), (40, 513518), (80, 256759), (97, 211760), (194, 105880), (388, 52940), (485, 42352), (776, 26470), (970, 21176), (1552, 13235), (1940, 10588), (2647, 7760), (3880, 5294)]