21045805

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{23}}^1\times {\mathrm{127}}^1\times {\mathrm{131}}^1$

素因数の和:297

約数の個数: 32

約数和(自身を含む): 29196288

約数和(自身を除く): 8150483

約数列:

[1, 5, 11, 23, 55, 115, 127, 131, 253, 635, 655, 1265, 1397, 1441, 2921, 3013, 6985, 7205, 14605, 15065, 16637, 32131, 33143, 83185, 160655, 165715, 183007, 382651, 915035, 1913255, 4209161, 21045805]

約数ペア:

[(1, 21045805), (5, 4209161), (11, 1913255), (23, 915035), (55, 382651), (115, 183007), (127, 165715), (131, 160655), (253, 83185), (635, 33143), (655, 32131), (1265, 16637), (1397, 15065), (1441, 14605), (2921, 7205), (3013, 6985)]