21247135

素因数分解:

$5^1\times 7^3\times {\mathrm{13}}^1\times {\mathrm{953}}^1$

素因数の和:992

約数の個数: 32

約数和(自身を含む): 32054400

約数和(自身を除く): 10807265

約数列:

[1, 5, 7, 13, 35, 49, 65, 91, 245, 343, 455, 637, 953, 1715, 3185, 4459, 4765, 6671, 12389, 22295, 33355, 46697, 61945, 86723, 233485, 326879, 433615, 607061, 1634395, 3035305, 4249427, 21247135]

約数ペア:

[(1, 21247135), (5, 4249427), (7, 3035305), (13, 1634395), (35, 607061), (49, 433615), (65, 326879), (91, 233485), (245, 86723), (343, 61945), (455, 46697), (637, 33355), (953, 22295), (1715, 12389), (3185, 6671), (4459, 4765)]