21049880

素因数分解:

$2^3\times 5^1\times {\mathrm{61}}^1\times {\mathrm{8627}}^1$

素因数の和:8699

約数の個数: 32

約数和(自身を含む): 48144240

約数和(自身を除く): 27094360

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 61, 122, 244, 305, 488, 610, 1220, 2440, 8627, 17254, 34508, 43135, 69016, 86270, 172540, 345080, 526247, 1052494, 2104988, 2631235, 4209976, 5262470, 10524940, 21049880]

約数ペア:

[(1, 21049880), (2, 10524940), (4, 5262470), (5, 4209976), (8, 2631235), (10, 2104988), (20, 1052494), (40, 526247), (61, 345080), (122, 172540), (244, 86270), (305, 69016), (488, 43135), (610, 34508), (1220, 17254), (2440, 8627)]