51388880

素因数分解:

$2^4\times 5^1\times {\mathrm{642361}}^1$

素因数の和:642374

約数の個数: 20

約数和(自身を含む): 119479332

約数和(自身を除く): 68090452

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 642361, 1284722, 2569444, 3211805, 5138888, 6423610, 10277776, 12847220, 25694440, 51388880]

約数ペア:

[(1, 51388880), (2, 25694440), (4, 12847220), (5, 10277776), (8, 6423610), (10, 5138888), (16, 3211805), (20, 2569444), (40, 1284722), (80, 642361)]