19917920

素因数分解:

$2^5\times 5^1\times {\mathrm{11}}^1\times {\mathrm{11317}}^1$

素因数の和:11343

約数の個数: 48

約数和(自身を含む): 51338448

約数和(自身を除く): 31420528

約数列:

[1, 2, 4, 5, 8, 10, 11, 16, 20, 22, 32, 40, 44, 55, 80, 88, 110, 160, 176, 220, 352, 440, 880, 1760, 11317, 22634, 45268, 56585, 90536, 113170, 124487, 181072, 226340, 248974, 362144, 452680, 497948, 622435, 905360, 995896, 1244870, 1810720, 1991792, 2489740, 3983584, 4979480, 9958960, 19917920]

約数ペア:

[(1, 19917920), (2, 9958960), (4, 4979480), (5, 3983584), (8, 2489740), (10, 1991792), (11, 1810720), (16, 1244870), (20, 995896), (22, 905360), (32, 622435), (40, 497948), (44, 452680), (55, 362144), (80, 248974), (88, 226340), (110, 181072), (160, 124487), (176, 113170), (220, 90536), (352, 56585), (440, 45268), (880, 22634), (1760, 11317)]