21056931

素因数分解:

$3^2\times 7^1\times {\mathrm{17}}^1\times {\mathrm{19661}}^1$

素因数の和:19691

約数の個数: 24

約数和(自身を含む): 36807264

約数和(自身を除く): 15750333

約数列:

[1, 3, 7, 9, 17, 21, 51, 63, 119, 153, 357, 1071, 19661, 58983, 137627, 176949, 334237, 412881, 1002711, 1238643, 2339659, 3008133, 7018977, 21056931]

約数ペア:

[(1, 21056931), (3, 7018977), (7, 3008133), (9, 2339659), (17, 1238643), (21, 1002711), (51, 412881), (63, 334237), (119, 176949), (153, 137627), (357, 58983), (1071, 19661)]