81239780

素因数分解:

$2^2\times 5^1\times {\mathrm{809}}^1\times {\mathrm{5021}}^1$

素因数の和:5839

約数の個数: 24

約数和(自身を含む): 170848440

約数和(自身を除く): 89608660

約数列:

[1, 2, 4, 5, 10, 20, 809, 1618, 3236, 4045, 5021, 8090, 10042, 16180, 20084, 25105, 50210, 100420, 4061989, 8123978, 16247956, 20309945, 40619890, 81239780]

約数ペア:

[(1, 81239780), (2, 40619890), (4, 20309945), (5, 16247956), (10, 8123978), (20, 4061989), (809, 100420), (1618, 50210), (3236, 25105), (4045, 20084), (5021, 16180), (8090, 10042)]