20805988

素因数分解:

$2^2\times 7^2\times {\mathrm{19}}^1\times {\mathrm{37}}^1\times {\mathrm{151}}^1$

素因数の和:225

約数の個数: 72

約数和(自身を含む): 46092480

約数和(自身を除く): 25286492

約数列:

[1, 2, 4, 7, 14, 19, 28, 37, 38, 49, 74, 76, 98, 133, 148, 151, 196, 259, 266, 302, 518, 532, 604, 703, 931, 1036, 1057, 1406, 1813, 1862, 2114, 2812, 2869, 3626, 3724, 4228, 4921, 5587, 5738, 7252, 7399, 9842, 11174, 11476, 14798, 19684, 20083, 22348, 29596, 34447, 39109, 40166, 68894, 78218, 80332, 106153, 137788, 140581, 156436, 212306, 273763, 281162, 424612, 547526, 562324, 743071, 1095052, 1486142, 2972284, 5201497, 10402994, 20805988]

約数ペア:

[(1, 20805988), (2, 10402994), (4, 5201497), (7, 2972284), (14, 1486142), (19, 1095052), (28, 743071), (37, 562324), (38, 547526), (49, 424612), (74, 281162), (76, 273763), (98, 212306), (133, 156436), (148, 140581), (151, 137788), (196, 106153), (259, 80332), (266, 78218), (302, 68894), (518, 40166), (532, 39109), (604, 34447), (703, 29596), (931, 22348), (1036, 20083), (1057, 19684), (1406, 14798), (1813, 11476), (1862, 11174), (2114, 9842), (2812, 7399), (2869, 7252), (3626, 5738), (3724, 5587), (4228, 4921)]