81003880

素因数分解:

$2^3\times 5^1\times {\mathrm{397}}^1\times {\mathrm{5101}}^1$

素因数の和:5509

約数の個数: 32

約数和(自身を含む): 182753640

約数和(自身を除く): 101749760

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 397, 794, 1588, 1985, 3176, 3970, 5101, 7940, 10202, 15880, 20404, 25505, 40808, 51010, 102020, 204040, 2025097, 4050194, 8100388, 10125485, 16200776, 20250970, 40501940, 81003880]

約数ペア:

[(1, 81003880), (2, 40501940), (4, 20250970), (5, 16200776), (8, 10125485), (10, 8100388), (20, 4050194), (40, 2025097), (397, 204040), (794, 102020), (1588, 51010), (1985, 40808), (3176, 25505), (3970, 20404), (5101, 15880), (7940, 10202)]