81699440

素因数分解:

$2^4\times 5^1\times {\mathrm{1021243}}^1$

素因数の和:1021256

約数の個数: 20

約数和(自身を含む): 189951384

約数和(自身を除く): 108251944

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 1021243, 2042486, 4084972, 5106215, 8169944, 10212430, 16339888, 20424860, 40849720, 81699440]

約数ペア:

[(1, 81699440), (2, 40849720), (4, 20424860), (5, 16339888), (8, 10212430), (10, 8169944), (16, 5106215), (20, 4084972), (40, 2042486), (80, 1021243)]