21065275

素因数分解:

$5^2\times 7^1\times {\mathrm{11}}^1\times {\mathrm{31}}^1\times {\mathrm{353}}^1$

素因数の和:412

約数の個数: 48

約数和(自身を含む): 33712128

約数和(自身を除く): 12646853

約数列:

[1, 5, 7, 11, 25, 31, 35, 55, 77, 155, 175, 217, 275, 341, 353, 385, 775, 1085, 1705, 1765, 1925, 2387, 2471, 3883, 5425, 8525, 8825, 10943, 11935, 12355, 19415, 27181, 54715, 59675, 61775, 76601, 97075, 120373, 135905, 273575, 383005, 601865, 679525, 842611, 1915025, 3009325, 4213055, 21065275]

約数ペア:

[(1, 21065275), (5, 4213055), (7, 3009325), (11, 1915025), (25, 842611), (31, 679525), (35, 601865), (55, 383005), (77, 273575), (155, 135905), (175, 120373), (217, 97075), (275, 76601), (341, 61775), (353, 59675), (385, 54715), (775, 27181), (1085, 19415), (1705, 12355), (1765, 11935), (1925, 10943), (2387, 8825), (2471, 8525), (3883, 5425)]