20999958

素因数分解:

$2^1\times 3^1\times 7^1\times {\mathrm{31}}^1\times {\mathrm{127}}^2$

素因数の和:297

約数の個数: 48

約数和(自身を含む): 49941504

約数和(自身を除く): 28941546

約数列:

[1, 2, 3, 6, 7, 14, 21, 31, 42, 62, 93, 127, 186, 217, 254, 381, 434, 651, 762, 889, 1302, 1778, 2667, 3937, 5334, 7874, 11811, 16129, 23622, 27559, 32258, 48387, 55118, 82677, 96774, 112903, 165354, 225806, 338709, 499999, 677418, 999998, 1499997, 2999994, 3499993, 6999986, 10499979, 20999958]

約数ペア:

[(1, 20999958), (2, 10499979), (3, 6999986), (6, 3499993), (7, 2999994), (14, 1499997), (21, 999998), (31, 677418), (42, 499999), (62, 338709), (93, 225806), (127, 165354), (186, 112903), (217, 96774), (254, 82677), (381, 55118), (434, 48387), (651, 32258), (762, 27559), (889, 23622), (1302, 16129), (1778, 11811), (2667, 7874), (3937, 5334)]