21309885

素因数分解:

$3^5\times 5^1\times {\mathrm{17539}}^1$

素因数の和:17559

約数の個数: 24

約数和(自身を含む): 38307360

約数和(自身を除く): 16997475

約数列:

[1, 3, 5, 9, 15, 27, 45, 81, 135, 243, 405, 1215, 17539, 52617, 87695, 157851, 263085, 473553, 789255, 1420659, 2367765, 4261977, 7103295, 21309885]

約数ペア:

[(1, 21309885), (3, 7103295), (5, 4261977), (9, 2367765), (15, 1420659), (27, 789255), (45, 473553), (81, 263085), (135, 157851), (243, 87695), (405, 52617), (1215, 17539)]