19907965

素因数分解:

$5^1\times 7^2\times {\mathrm{11}}^1\times {\mathrm{83}}^1\times {\mathrm{89}}^1$

素因数の和:202

約数の個数: 48

約数和(自身を含む): 31026240

約数和(自身を除く): 11118275

約数列:

[1, 5, 7, 11, 35, 49, 55, 77, 83, 89, 245, 385, 415, 445, 539, 581, 623, 913, 979, 2695, 2905, 3115, 4067, 4361, 4565, 4895, 6391, 6853, 7387, 20335, 21805, 31955, 34265, 36935, 44737, 47971, 51709, 81257, 223685, 239855, 258545, 361963, 406285, 568799, 1809815, 2843995, 3981593, 19907965]

約数ペア:

[(1, 19907965), (5, 3981593), (7, 2843995), (11, 1809815), (35, 568799), (49, 406285), (55, 361963), (77, 258545), (83, 239855), (89, 223685), (245, 81257), (385, 51709), (415, 47971), (445, 44737), (539, 36935), (581, 34265), (623, 31955), (913, 21805), (979, 20335), (2695, 7387), (2905, 6853), (3115, 6391), (4067, 4895), (4361, 4565)]