21405895

素因数分解:

$5^1\times 7^2\times {\mathrm{41}}^1\times {\mathrm{2131}}^1$

素因数の和:2191

約数の個数: 24

約数和(自身を含む): 30624048

約数和(自身を除く): 9218153

約数列:

[1, 5, 7, 35, 41, 49, 205, 245, 287, 1435, 2009, 2131, 10045, 10655, 14917, 74585, 87371, 104419, 436855, 522095, 611597, 3057985, 4281179, 21405895]

約数ペア:

[(1, 21405895), (5, 4281179), (7, 3057985), (35, 611597), (41, 522095), (49, 436855), (205, 104419), (245, 87371), (287, 74585), (1435, 14917), (2009, 10655), (2131, 10045)]