20818960

素因数分解:

$2^4\times 5^1\times {\mathrm{197}}^1\times {\mathrm{1321}}^1$

素因数の和:1531

約数の個数: 40

約数和(自身を含む): 48686616

約数和(自身を除く): 27867656

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 197, 394, 788, 985, 1321, 1576, 1970, 2642, 3152, 3940, 5284, 6605, 7880, 10568, 13210, 15760, 21136, 26420, 52840, 105680, 260237, 520474, 1040948, 1301185, 2081896, 2602370, 4163792, 5204740, 10409480, 20818960]

約数ペア:

[(1, 20818960), (2, 10409480), (4, 5204740), (5, 4163792), (8, 2602370), (10, 2081896), (16, 1301185), (20, 1040948), (40, 520474), (80, 260237), (197, 105680), (394, 52840), (788, 26420), (985, 21136), (1321, 15760), (1576, 13210), (1970, 10568), (2642, 7880), (3152, 6605), (3940, 5284)]