21418929

素因数分解:

$3^2\times 7^2\times {\mathrm{17}}^1\times {\mathrm{2857}}^1$

素因数の和:2894

約数の個数: 36

約数和(自身を含む): 38120004

約数和(自身を除く): 16701075

約数列:

[1, 3, 7, 9, 17, 21, 49, 51, 63, 119, 147, 153, 357, 441, 833, 1071, 2499, 2857, 7497, 8571, 19999, 25713, 48569, 59997, 139993, 145707, 179991, 339983, 419979, 437121, 1019949, 1259937, 2379881, 3059847, 7139643, 21418929]

約数ペア:

[(1, 21418929), (3, 7139643), (7, 3059847), (9, 2379881), (17, 1259937), (21, 1019949), (49, 437121), (51, 419979), (63, 339983), (119, 179991), (147, 145707), (153, 139993), (357, 59997), (441, 48569), (833, 25713), (1071, 19999), (2499, 8571), (2857, 7497)]