81121940

素因数分解:

$2^2\times 5^1\times {\mathrm{79}}^1\times {\mathrm{51343}}^1$

素因数の和:51431

約数の個数: 24

約数和(自身を含む): 172515840

約数和(自身を除く): 91393900

約数列:

[1, 2, 4, 5, 10, 20, 79, 158, 316, 395, 790, 1580, 51343, 102686, 205372, 256715, 513430, 1026860, 4056097, 8112194, 16224388, 20280485, 40560970, 81121940]

約数ペア:

[(1, 81121940), (2, 40560970), (4, 20280485), (5, 16224388), (10, 8112194), (20, 4056097), (79, 1026860), (158, 513430), (316, 256715), (395, 205372), (790, 102686), (1580, 51343)]