21078351

素因数分解:

$3^2\times 7^1\times {\mathrm{17}}^1\times {\mathrm{19681}}^1$

素因数の和:19711

約数の個数: 24

約数和(自身を含む): 36844704

約数和(自身を除く): 15766353

約数列:

[1, 3, 7, 9, 17, 21, 51, 63, 119, 153, 357, 1071, 19681, 59043, 137767, 177129, 334577, 413301, 1003731, 1239903, 2342039, 3011193, 7026117, 21078351]

約数ペア:

[(1, 21078351), (3, 7026117), (7, 3011193), (9, 2342039), (17, 1239903), (21, 1003731), (51, 413301), (63, 334577), (119, 177129), (153, 137767), (357, 59043), (1071, 19681)]