21991928

素因数分解:

$2^3\times 7^1\times {\mathrm{499}}^1\times {\mathrm{787}}^1$

素因数の和:1299

約数の個数: 32

約数和(自身を含む): 47280000

約数和(自身を除く): 25288072

約数列:

[1, 2, 4, 7, 8, 14, 28, 56, 499, 787, 998, 1574, 1996, 3148, 3493, 3992, 5509, 6296, 6986, 11018, 13972, 22036, 27944, 44072, 392713, 785426, 1570852, 2748991, 3141704, 5497982, 10995964, 21991928]

約数ペア:

[(1, 21991928), (2, 10995964), (4, 5497982), (7, 3141704), (8, 2748991), (14, 1570852), (28, 785426), (56, 392713), (499, 44072), (787, 27944), (998, 22036), (1574, 13972), (1996, 11018), (3148, 6986), (3493, 6296), (3992, 5509)]