21561080

素因数分解:

$2^3\times 5^1\times {\mathrm{41}}^1\times {\mathrm{13147}}^1$

素因数の和:13199

約数の個数: 32

約数和(自身を含む): 49699440

約数和(自身を除く): 28138360

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 41, 82, 164, 205, 328, 410, 820, 1640, 13147, 26294, 52588, 65735, 105176, 131470, 262940, 525880, 539027, 1078054, 2156108, 2695135, 4312216, 5390270, 10780540, 21561080]

約数ペア:

[(1, 21561080), (2, 10780540), (4, 5390270), (5, 4312216), (8, 2695135), (10, 2156108), (20, 1078054), (40, 539027), (41, 525880), (82, 262940), (164, 131470), (205, 105176), (328, 65735), (410, 52588), (820, 26294), (1640, 13147)]