21056427

素因数分解:

$3^2\times 7^3\times {\mathrm{19}}^1\times {\mathrm{359}}^1$

素因数の和:405

約数の個数: 48

約数和(自身を含む): 37440000

約数和(自身を除く): 16383573

約数列:

[1, 3, 7, 9, 19, 21, 49, 57, 63, 133, 147, 171, 343, 359, 399, 441, 931, 1029, 1077, 1197, 2513, 2793, 3087, 3231, 6517, 6821, 7539, 8379, 17591, 19551, 20463, 22617, 47747, 52773, 58653, 61389, 123137, 143241, 158319, 334229, 369411, 429723, 1002687, 1108233, 2339603, 3008061, 7018809, 21056427]

約数ペア:

[(1, 21056427), (3, 7018809), (7, 3008061), (9, 2339603), (19, 1108233), (21, 1002687), (49, 429723), (57, 369411), (63, 334229), (133, 158319), (147, 143241), (171, 123137), (343, 61389), (359, 58653), (399, 52773), (441, 47747), (931, 22617), (1029, 20463), (1077, 19551), (1197, 17591), (2513, 8379), (2793, 7539), (3087, 6821), (3231, 6517)]