21108940

素因数分解:

$2^2\times 5^1\times {\mathrm{23}}^1\times {\mathrm{109}}^1\times {\mathrm{421}}^1$

素因数の和:562

約数の個数: 48

約数和(自身を含む): 46791360

約数和(自身を除く): 25682420

約数列:

[1, 2, 4, 5, 10, 20, 23, 46, 92, 109, 115, 218, 230, 421, 436, 460, 545, 842, 1090, 1684, 2105, 2180, 2507, 4210, 5014, 8420, 9683, 10028, 12535, 19366, 25070, 38732, 45889, 48415, 50140, 91778, 96830, 183556, 193660, 229445, 458890, 917780, 1055447, 2110894, 4221788, 5277235, 10554470, 21108940]

約数ペア:

[(1, 21108940), (2, 10554470), (4, 5277235), (5, 4221788), (10, 2110894), (20, 1055447), (23, 917780), (46, 458890), (92, 229445), (109, 193660), (115, 183556), (218, 96830), (230, 91778), (421, 50140), (436, 48415), (460, 45889), (545, 38732), (842, 25070), (1090, 19366), (1684, 12535), (2105, 10028), (2180, 9683), (2507, 8420), (4210, 5014)]