21028315

素因数分解:

$5^1\times 7^1\times {\mathrm{11}}^1\times {\mathrm{193}}^1\times {\mathrm{283}}^1$

素因数の和:499

約数の個数: 32

約数和(自身を含む): 31735296

約数和(自身を除く): 10706981

約数列:

[1, 5, 7, 11, 35, 55, 77, 193, 283, 385, 965, 1351, 1415, 1981, 2123, 3113, 6755, 9905, 10615, 14861, 15565, 21791, 54619, 74305, 108955, 273095, 382333, 600809, 1911665, 3004045, 4205663, 21028315]

約数ペア:

[(1, 21028315), (5, 4205663), (7, 3004045), (11, 1911665), (35, 600809), (55, 382333), (77, 273095), (193, 108955), (283, 74305), (385, 54619), (965, 21791), (1351, 15565), (1415, 14861), (1981, 10615), (2123, 9905), (3113, 6755)]