20991328

素因数分解:

$2^5\times {\mathrm{17}}^1\times {\mathrm{47}}^1\times {\mathrm{821}}^1$

素因数の和:895

約数の個数: 48

約数和(自身を含む): 44743104

約数和(自身を除く): 23751776

約数列:

[1, 2, 4, 8, 16, 17, 32, 34, 47, 68, 94, 136, 188, 272, 376, 544, 752, 799, 821, 1504, 1598, 1642, 3196, 3284, 6392, 6568, 12784, 13136, 13957, 25568, 26272, 27914, 38587, 55828, 77174, 111656, 154348, 223312, 308696, 446624, 617392, 655979, 1234784, 1311958, 2623916, 5247832, 10495664, 20991328]

約数ペア:

[(1, 20991328), (2, 10495664), (4, 5247832), (8, 2623916), (16, 1311958), (17, 1234784), (32, 655979), (34, 617392), (47, 446624), (68, 308696), (94, 223312), (136, 154348), (188, 111656), (272, 77174), (376, 55828), (544, 38587), (752, 27914), (799, 26272), (821, 25568), (1504, 13957), (1598, 13136), (1642, 12784), (3196, 6568), (3284, 6392)]