21378995

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{31}}^1\times {\mathrm{12539}}^1$

素因数の和:12586

約数の個数: 16

約数和(自身を含む): 28892160

約数和(自身を除く): 7513165

約数列:

[1, 5, 11, 31, 55, 155, 341, 1705, 12539, 62695, 137929, 388709, 689645, 1943545, 4275799, 21378995]

約数ペア:

[(1, 21378995), (5, 4275799), (11, 1943545), (31, 689645), (55, 388709), (155, 137929), (341, 62695), (1705, 12539)]