21256515

素因数分解:

$3^2\times 5^1\times 7^1\times {\mathrm{67481}}^1$

素因数の和:67499

約数の個数: 24

約数和(自身を含む): 42108768

約数和(自身を除く): 20852253

約数列:

[1, 3, 5, 7, 9, 15, 21, 35, 45, 63, 105, 315, 67481, 202443, 337405, 472367, 607329, 1012215, 1417101, 2361835, 3036645, 4251303, 7085505, 21256515]

約数ペア:

[(1, 21256515), (3, 7085505), (5, 4251303), (7, 3036645), (9, 2361835), (15, 1417101), (21, 1012215), (35, 607329), (45, 472367), (63, 337405), (105, 202443), (315, 67481)]