20786947 has 2 divisors, whose sum is σ = 20786948. Its totient is φ = 20786946.

The previous prime is 20786923. The next prime is 20786981. The reversal of 20786947 is 74968702.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20786947 - 2⁷ = 20786819 is a prime.

It is not a weakly prime, because it can be changed into another prime (20786047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10393473 + 10393474.

It is an arithmetic number, because the mean of its divisors is an integer number (10393474).

Almost surely, 2^20786947 is an apocalyptic number.

20786947 is a deficient number, since it is larger than the sum of its proper divisors (1).

20786947 is an equidigital number, since it uses as much as digits as its factorization.

20786947 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 169344, while the sum is 43.

The square root of 20786947 is about 4559.2704460253. The cubic root of 20786947 is about 274.9562332552.

It can be divided in two parts, 2078 and 6947, that added together give a square (9025 = 95²).

The spelling of 20786947 in words is "twenty million, seven hundred eighty-six thousand, nine hundred forty-seven".