21388892

素因数分解:

$2^2\times 7^2\times {\mathrm{29}}^1\times {\mathrm{53}}^1\times {\mathrm{71}}^1$

素因数の和:171

約数の個数: 72

約数和(自身を含む): 46539360

約数和(自身を除く): 25150468

約数列:

[1, 2, 4, 7, 14, 28, 29, 49, 53, 58, 71, 98, 106, 116, 142, 196, 203, 212, 284, 371, 406, 497, 742, 812, 994, 1421, 1484, 1537, 1988, 2059, 2597, 2842, 3074, 3479, 3763, 4118, 5194, 5684, 6148, 6958, 7526, 8236, 10388, 10759, 13916, 14413, 15052, 21518, 26341, 28826, 43036, 52682, 57652, 75313, 100891, 105364, 109127, 150626, 184387, 201782, 218254, 301252, 368774, 403564, 436508, 737548, 763889, 1527778, 3055556, 5347223, 10694446, 21388892]

約数ペア:

[(1, 21388892), (2, 10694446), (4, 5347223), (7, 3055556), (14, 1527778), (28, 763889), (29, 737548), (49, 436508), (53, 403564), (58, 368774), (71, 301252), (98, 218254), (106, 201782), (116, 184387), (142, 150626), (196, 109127), (203, 105364), (212, 100891), (284, 75313), (371, 57652), (406, 52682), (497, 43036), (742, 28826), (812, 26341), (994, 21518), (1421, 15052), (1484, 14413), (1537, 13916), (1988, 10759), (2059, 10388), (2597, 8236), (2842, 7526), (3074, 6958), (3479, 6148), (3763, 5684), (4118, 5194)]