18879440

素因数分解:

$2^4\times 5^1\times {\mathrm{409}}^1\times {\mathrm{577}}^1$

素因数の和:999

約数の個数: 40

約数和(自身を含む): 44078280

約数和(自身を除く): 25198840

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 409, 577, 818, 1154, 1636, 2045, 2308, 2885, 3272, 4090, 4616, 5770, 6544, 8180, 9232, 11540, 16360, 23080, 32720, 46160, 235993, 471986, 943972, 1179965, 1887944, 2359930, 3775888, 4719860, 9439720, 18879440]

約数ペア:

[(1, 18879440), (2, 9439720), (4, 4719860), (5, 3775888), (8, 2359930), (10, 1887944), (16, 1179965), (20, 943972), (40, 471986), (80, 235993), (409, 46160), (577, 32720), (818, 23080), (1154, 16360), (1636, 11540), (2045, 9232), (2308, 8180), (2885, 6544), (3272, 5770), (4090, 4616)]