21507129

素因数分解:

$3^2\times 7^3\times {\mathrm{6967}}^1$

素因数の和:6994

約数の個数: 24

約数和(自身を含む): 36233600

約数和(自身を除く): 14726471

約数列:

[1, 3, 7, 9, 21, 49, 63, 147, 343, 441, 1029, 3087, 6967, 20901, 48769, 62703, 146307, 341383, 438921, 1024149, 2389681, 3072447, 7169043, 21507129]

約数ペア:

[(1, 21507129), (3, 7169043), (7, 3072447), (9, 2389681), (21, 1024149), (49, 438921), (63, 341383), (147, 146307), (343, 62703), (441, 48769), (1029, 20901), (3087, 6967)]