21991625

素因数分解:

$5^3\times {\mathrm{17}}^1\times {\mathrm{79}}^1\times {\mathrm{131}}^1$

素因数の和:242

約数の個数: 32

約数和(自身を含む): 29652480

約数和(自身を除く): 7660855

約数列:

[1, 5, 17, 25, 79, 85, 125, 131, 395, 425, 655, 1343, 1975, 2125, 2227, 3275, 6715, 9875, 10349, 11135, 16375, 33575, 51745, 55675, 167875, 175933, 258725, 278375, 879665, 1293625, 4398325, 21991625]

約数ペア:

[(1, 21991625), (5, 4398325), (17, 1293625), (25, 879665), (79, 278375), (85, 258725), (125, 175933), (131, 167875), (395, 55675), (425, 51745), (655, 33575), (1343, 16375), (1975, 11135), (2125, 10349), (2227, 9875), (3275, 6715)]