21840155

素因数分解:

$5^1\times {\mathrm{17}}^1\times {\mathrm{89}}^1\times {\mathrm{2887}}^1$

素因数の和:2998

約数の個数: 16

約数和(自身を含む): 28071360

約数和(自身を除く): 6231205

約数列:

[1, 5, 17, 85, 89, 445, 1513, 2887, 7565, 14435, 49079, 245395, 256943, 1284715, 4368031, 21840155]

約数ペア:

[(1, 21840155), (5, 4368031), (17, 1284715), (85, 256943), (89, 245395), (445, 49079), (1513, 14435), (2887, 7565)]