20517784

素因数分解:

$2^3\times 7^1\times {\mathrm{31}}^1\times {\mathrm{53}}^1\times {\mathrm{223}}^1$

素因数の和:320

約数の個数: 64

約数和(自身を含む): 46448640

約数和(自身を除く): 25930856

約数列:

[1, 2, 4, 7, 8, 14, 28, 31, 53, 56, 62, 106, 124, 212, 217, 223, 248, 371, 424, 434, 446, 742, 868, 892, 1484, 1561, 1643, 1736, 1784, 2968, 3122, 3286, 6244, 6572, 6913, 11501, 11819, 12488, 13144, 13826, 23002, 23638, 27652, 46004, 47276, 48391, 55304, 82733, 92008, 94552, 96782, 165466, 193564, 330932, 366389, 387128, 661864, 732778, 1465556, 2564723, 2931112, 5129446, 10258892, 20517784]

約数ペア:

[(1, 20517784), (2, 10258892), (4, 5129446), (7, 2931112), (8, 2564723), (14, 1465556), (28, 732778), (31, 661864), (53, 387128), (56, 366389), (62, 330932), (106, 193564), (124, 165466), (212, 96782), (217, 94552), (223, 92008), (248, 82733), (371, 55304), (424, 48391), (434, 47276), (446, 46004), (742, 27652), (868, 23638), (892, 23002), (1484, 13826), (1561, 13144), (1643, 12488), (1736, 11819), (1784, 11501), (2968, 6913), (3122, 6572), (3286, 6244)]