21890169

素因数分解:

$3^5\times 7^1\times {\mathrm{17}}^1\times {\mathrm{757}}^1$

素因数の和:796

約数の個数: 48

約数和(自身を含む): 39731328

約数和(自身を除く): 17841159

約数列:

[1, 3, 7, 9, 17, 21, 27, 51, 63, 81, 119, 153, 189, 243, 357, 459, 567, 757, 1071, 1377, 1701, 2271, 3213, 4131, 5299, 6813, 9639, 12869, 15897, 20439, 28917, 38607, 47691, 61317, 90083, 115821, 143073, 183951, 270249, 347463, 429219, 810747, 1042389, 1287657, 2432241, 3127167, 7296723, 21890169]

約数ペア:

[(1, 21890169), (3, 7296723), (7, 3127167), (9, 2432241), (17, 1287657), (21, 1042389), (27, 810747), (51, 429219), (63, 347463), (81, 270249), (119, 183951), (153, 143073), (189, 115821), (243, 90083), (357, 61317), (459, 47691), (567, 38607), (757, 28917), (1071, 20439), (1377, 15897), (1701, 12869), (2271, 9639), (3213, 6813), (4131, 5299)]