21178665

素因数分解:

$3^5\times 5^1\times {\mathrm{17431}}^1$

素因数の和:17451

約数の個数: 24

約数和(自身を含む): 38071488

約数和(自身を除く): 16892823

約数列:

[1, 3, 5, 9, 15, 27, 45, 81, 135, 243, 405, 1215, 17431, 52293, 87155, 156879, 261465, 470637, 784395, 1411911, 2353185, 4235733, 7059555, 21178665]

約数ペア:

[(1, 21178665), (3, 7059555), (5, 4235733), (9, 2353185), (15, 1411911), (27, 784395), (45, 470637), (81, 261465), (135, 156879), (243, 87155), (405, 52293), (1215, 17431)]