21120568

素因数分解:

$2^3\times 7^3\times {\mathrm{43}}^1\times {\mathrm{179}}^1$

素因数の和:249

約数の個数: 64

約数和(自身を含む): 47520000

約数和(自身を除く): 26399432

約数列:

[1, 2, 4, 7, 8, 14, 28, 43, 49, 56, 86, 98, 172, 179, 196, 301, 343, 344, 358, 392, 602, 686, 716, 1204, 1253, 1372, 1432, 2107, 2408, 2506, 2744, 4214, 5012, 7697, 8428, 8771, 10024, 14749, 15394, 16856, 17542, 29498, 30788, 35084, 53879, 58996, 61397, 61576, 70168, 107758, 117992, 122794, 215516, 245588, 377153, 431032, 491176, 754306, 1508612, 2640071, 3017224, 5280142, 10560284, 21120568]

約数ペア:

[(1, 21120568), (2, 10560284), (4, 5280142), (7, 3017224), (8, 2640071), (14, 1508612), (28, 754306), (43, 491176), (49, 431032), (56, 377153), (86, 245588), (98, 215516), (172, 122794), (179, 117992), (196, 107758), (301, 70168), (343, 61576), (344, 61397), (358, 58996), (392, 53879), (602, 35084), (686, 30788), (716, 29498), (1204, 17542), (1253, 16856), (1372, 15394), (1432, 14749), (2107, 10024), (2408, 8771), (2506, 8428), (2744, 7697), (4214, 5012)]