1991905

素因数分解:

$5^1\times {\mathrm{31}}^1\times {\mathrm{71}}^1\times {\mathrm{181}}^1$

素因数の和:288

約数の個数: 16

約数和(自身を含む): 2515968

約数和(自身を除く): 524063

約数列:

[1, 5, 31, 71, 155, 181, 355, 905, 2201, 5611, 11005, 12851, 28055, 64255, 398381, 1991905]

約数ペア:

[(1, 1991905), (5, 398381), (31, 64255), (71, 28055), (155, 12851), (181, 11005), (355, 5611), (905, 2201)]