21885409

素因数分解:

$7^2\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{43}}^1\times {\mathrm{47}}^1$

素因数の和:134

約数の個数: 48

約数和(自身を含む): 30336768

約数和(自身を除く): 8451359

約数列:

[1, 7, 13, 17, 43, 47, 49, 91, 119, 221, 301, 329, 559, 611, 637, 731, 799, 833, 1547, 2021, 2107, 2303, 3913, 4277, 5117, 5593, 9503, 10387, 10829, 14147, 26273, 27391, 29939, 34357, 35819, 39151, 66521, 72709, 99029, 183911, 240499, 446641, 465647, 508963, 1287377, 1683493, 3126487, 21885409]

約数ペア:

[(1, 21885409), (7, 3126487), (13, 1683493), (17, 1287377), (43, 508963), (47, 465647), (49, 446641), (91, 240499), (119, 183911), (221, 99029), (301, 72709), (329, 66521), (559, 39151), (611, 35819), (637, 34357), (731, 29939), (799, 27391), (833, 26273), (1547, 14147), (2021, 10829), (2107, 10387), (2303, 9503), (3913, 5593), (4277, 5117)]