81561380

素因数分解:

$2^2\times 5^1\times {\mathrm{89}}^1\times {\mathrm{45821}}^1$

素因数の和:45919

約数の個数: 24

約数和(自身を含む): 173207160

約数和(自身を除く): 91645780

約数列:

[1, 2, 4, 5, 10, 20, 89, 178, 356, 445, 890, 1780, 45821, 91642, 183284, 229105, 458210, 916420, 4078069, 8156138, 16312276, 20390345, 40780690, 81561380]

約数ペア:

[(1, 81561380), (2, 40780690), (4, 20390345), (5, 16312276), (10, 8156138), (20, 4078069), (89, 916420), (178, 458210), (356, 229105), (445, 183284), (890, 91642), (1780, 45821)]