21690095

素因数分解:

$5^1\times 7^2\times {\mathrm{223}}^1\times {\mathrm{397}}^1$

素因数の和:639

約数の個数: 24

約数和(自身を含む): 30489984

約数和(自身を除く): 8799889

約数列:

[1, 5, 7, 35, 49, 223, 245, 397, 1115, 1561, 1985, 2779, 7805, 10927, 13895, 19453, 54635, 88531, 97265, 442655, 619717, 3098585, 4338019, 21690095]

約数ペア:

[(1, 21690095), (5, 4338019), (7, 3098585), (35, 619717), (49, 442655), (223, 97265), (245, 88531), (397, 54635), (1115, 19453), (1561, 13895), (1985, 10927), (2779, 7805)]