21287655

素因数分解:

$3^2\times 5^1\times {\mathrm{17}}^1\times {\mathrm{27827}}^1$

素因数の和:27855

約数の個数: 24

約数和(自身を含む): 39070512

約数和(自身を除く): 17782857

約数列:

[1, 3, 5, 9, 15, 17, 45, 51, 85, 153, 255, 765, 27827, 83481, 139135, 250443, 417405, 473059, 1252215, 1419177, 2365295, 4257531, 7095885, 21287655]

約数ペア:

[(1, 21287655), (3, 7095885), (5, 4257531), (9, 2365295), (15, 1419177), (17, 1252215), (45, 473059), (51, 417405), (85, 250443), (153, 139135), (255, 83481), (765, 27827)]