31216720

素因数分解:

$2^4\times 5^1\times {\mathrm{390209}}^1$

素因数の和:390222

約数の個数: 20

約数和(自身を含む): 72579060

約数和(自身を除く): 41362340

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 390209, 780418, 1560836, 1951045, 3121672, 3902090, 6243344, 7804180, 15608360, 31216720]

約数ペア:

[(1, 31216720), (2, 15608360), (4, 7804180), (5, 6243344), (8, 3902090), (10, 3121672), (16, 1951045), (20, 1560836), (40, 780418), (80, 390209)]