31391720

素因数分解:

$2^3\times 5^1\times {\mathrm{43}}^1\times {\mathrm{18251}}^1$

素因数の和:18305

約数の個数: 32

約数和(自身を含む): 72277920

約数和(自身を除く): 40886200

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 43, 86, 172, 215, 344, 430, 860, 1720, 18251, 36502, 73004, 91255, 146008, 182510, 365020, 730040, 784793, 1569586, 3139172, 3923965, 6278344, 7847930, 15695860, 31391720]

約数ペア:

[(1, 31391720), (2, 15695860), (4, 7847930), (5, 6278344), (8, 3923965), (10, 3139172), (20, 1569586), (40, 784793), (43, 730040), (86, 365020), (172, 182510), (215, 146008), (344, 91255), (430, 73004), (860, 36502), (1720, 18251)]