21505715

素因数分解:

$5^1\times 7^1\times {\mathrm{11}}^1\times {\mathrm{83}}^1\times {\mathrm{673}}^1$

素因数の和:779

約数の個数: 32

約数和(自身を含む): 32610816

約数和(自身を除く): 11105101

約数列:

[1, 5, 7, 11, 35, 55, 77, 83, 385, 415, 581, 673, 913, 2905, 3365, 4565, 4711, 6391, 7403, 23555, 31955, 37015, 51821, 55859, 259105, 279295, 391013, 614449, 1955065, 3072245, 4301143, 21505715]

約数ペア:

[(1, 21505715), (5, 4301143), (7, 3072245), (11, 1955065), (35, 614449), (55, 391013), (77, 279295), (83, 259105), (385, 55859), (415, 51821), (581, 37015), (673, 31955), (913, 23555), (2905, 7403), (3365, 6391), (4565, 4711)]