20987001

素因数分解:

$3^2\times 7^1\times {\mathrm{19}}^1\times {\mathrm{89}}^1\times {\mathrm{197}}^1$

素因数の和:318

約数の個数: 48

約数和(自身を含む): 37065600

約数和(自身を除く): 16078599

約数列:

[1, 3, 7, 9, 19, 21, 57, 63, 89, 133, 171, 197, 267, 399, 591, 623, 801, 1197, 1379, 1691, 1773, 1869, 3743, 4137, 5073, 5607, 11229, 11837, 12411, 15219, 17533, 26201, 33687, 35511, 52599, 78603, 106533, 122731, 157797, 235809, 333127, 368193, 999381, 1104579, 2331889, 2998143, 6995667, 20987001]

約数ペア:

[(1, 20987001), (3, 6995667), (7, 2998143), (9, 2331889), (19, 1104579), (21, 999381), (57, 368193), (63, 333127), (89, 235809), (133, 157797), (171, 122731), (197, 106533), (267, 78603), (399, 52599), (591, 35511), (623, 33687), (801, 26201), (1197, 17533), (1379, 15219), (1691, 12411), (1773, 11837), (1869, 11229), (3743, 5607), (4137, 5073)]