21505561

素因数分解:

$7^2\times {\mathrm{11}}^1\times {\mathrm{17}}^1\times {\mathrm{2347}}^1$

素因数の和:2389

約数の個数: 24

約数和(自身を含む): 28908576

約数和(自身を除く): 7403015

約数列:

[1, 7, 11, 17, 49, 77, 119, 187, 539, 833, 1309, 2347, 9163, 16429, 25817, 39899, 115003, 180719, 279293, 438889, 1265033, 1955051, 3072223, 21505561]

約数ペア:

[(1, 21505561), (7, 3072223), (11, 1955051), (17, 1265033), (49, 438889), (77, 279293), (119, 180719), (187, 115003), (539, 39899), (833, 25817), (1309, 16429), (2347, 9163)]