18721985

素因数分解:

$5^1\times {\mathrm{31}}^1\times {\mathrm{43}}^1\times {\mathrm{53}}^2$

素因数の和:185

約数の個数: 24

約数和(自身を含む): 24186624

約数和(自身を除く): 5464639

約数列:

[1, 5, 31, 43, 53, 155, 215, 265, 1333, 1643, 2279, 2809, 6665, 8215, 11395, 14045, 70649, 87079, 120787, 353245, 435395, 603935, 3744397, 18721985]

約数ペア:

[(1, 18721985), (5, 3744397), (31, 603935), (43, 435395), (53, 353245), (155, 120787), (215, 87079), (265, 70649), (1333, 14045), (1643, 11395), (2279, 8215), (2809, 6665)]