19985217

素因数分解:

$3^1\times 7^1\times {\mathrm{17}}^2\times {\mathrm{37}}^1\times {\mathrm{89}}^1$

素因数の和:170

約数の個数: 48

約数和(自身を含む): 33598080

約数和(自身を除く): 13612863

約数列:

[1, 3, 7, 17, 21, 37, 51, 89, 111, 119, 259, 267, 289, 357, 623, 629, 777, 867, 1513, 1869, 1887, 2023, 3293, 4403, 4539, 6069, 9879, 10591, 10693, 13209, 23051, 25721, 31773, 32079, 55981, 69153, 74851, 77163, 167943, 180047, 224553, 391867, 540141, 951677, 1175601, 2855031, 6661739, 19985217]

約数ペア:

[(1, 19985217), (3, 6661739), (7, 2855031), (17, 1175601), (21, 951677), (37, 540141), (51, 391867), (89, 224553), (111, 180047), (119, 167943), (259, 77163), (267, 74851), (289, 69153), (357, 55981), (623, 32079), (629, 31773), (777, 25721), (867, 23051), (1513, 13209), (1869, 10693), (1887, 10591), (2023, 9879), (3293, 6069), (4403, 4539)]