21489215

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{71}}^1\times {\mathrm{5503}}^1$

素因数の和:5590

約数の個数: 16

約数和(自身を含む): 28532736

約数和(自身を除く): 7043521

約数列:

[1, 5, 11, 55, 71, 355, 781, 3905, 5503, 27515, 60533, 302665, 390713, 1953565, 4297843, 21489215]

約数ペア:

[(1, 21489215), (5, 4297843), (11, 1953565), (55, 390713), (71, 302665), (355, 60533), (781, 27515), (3905, 5503)]