21784905

素因数分解:

$3^2\times 5^1\times {\mathrm{17}}^1\times {\mathrm{28477}}^1$

素因数の和:28505

約数の個数: 24

約数和(自身を含む): 39983112

約数和(自身を除く): 18198207

約数列:

[1, 3, 5, 9, 15, 17, 45, 51, 85, 153, 255, 765, 28477, 85431, 142385, 256293, 427155, 484109, 1281465, 1452327, 2420545, 4356981, 7261635, 21784905]

約数ペア:

[(1, 21784905), (3, 7261635), (5, 4356981), (9, 2420545), (15, 1452327), (17, 1281465), (45, 484109), (51, 427155), (85, 256293), (153, 142385), (255, 85431), (765, 28477)]