64739440

素因数分解:

$2^4\times 5^1\times {\mathrm{809243}}^1$

素因数の和:809256

約数の個数: 20

約数和(自身を含む): 150519384

約数和(自身を除く): 85779944

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 809243, 1618486, 3236972, 4046215, 6473944, 8092430, 12947888, 16184860, 32369720, 64739440]

約数ペア:

[(1, 64739440), (2, 32369720), (4, 16184860), (5, 12947888), (8, 8092430), (10, 6473944), (16, 4046215), (20, 3236972), (40, 1618486), (80, 809243)]