21026915

素因数分解:

$5^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{37}}^1\times {\mathrm{1249}}^1$

素因数の和:1311

約数の個数: 32

約数和(自身を含む): 31920000

約数和(自身を除く): 10893085

約数列:

[1, 5, 7, 13, 35, 37, 65, 91, 185, 259, 455, 481, 1249, 1295, 2405, 3367, 6245, 8743, 16237, 16835, 43715, 46213, 81185, 113659, 231065, 323491, 568295, 600769, 1617455, 3003845, 4205383, 21026915]

約数ペア:

[(1, 21026915), (5, 4205383), (7, 3003845), (13, 1617455), (35, 600769), (37, 568295), (65, 323491), (91, 231065), (185, 113659), (259, 81185), (455, 46213), (481, 43715), (1249, 16835), (1295, 16237), (2405, 8743), (3367, 6245)]