21278537

素因数分解:

$7^1\times {\mathrm{19}}^1\times {\mathrm{139}}^1\times {\mathrm{1151}}^1$

素因数の和:1316

約数の個数: 16

約数和(自身を含む): 25804800

約数和(自身を除く): 4526263

約数列:

[1, 7, 19, 133, 139, 973, 1151, 2641, 8057, 18487, 21869, 153083, 159989, 1119923, 3039791, 21278537]

約数ペア:

[(1, 21278537), (7, 3039791), (19, 1119923), (133, 159989), (139, 153083), (973, 21869), (1151, 18487), (2641, 8057)]