20786071 has 4 divisors (see below), whose sum is σ = 21269512. Its totient is φ = 20302632.

The previous prime is 20786047. The next prime is 20786099. The reversal of 20786071 is 17068702.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20786071 - 2¹⁵ = 20753303 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20786021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 241656 + ... + 241741.

It is an arithmetic number, because the mean of its divisors is an integer number (5317378).

Almost surely, 2^20786071 is an apocalyptic number.

20786071 is a deficient number, since it is larger than the sum of its proper divisors (483441).

20786071 is an equidigital number, since it uses as much as digits as its factorization.

20786071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 483440.

The product of its (nonzero) digits is 4704, while the sum is 31.

The square root of 20786071 is about 4559.1743770117. The cubic root of 20786071 is about 274.9523708146.

The spelling of 20786071 in words is "twenty million, seven hundred eighty-six thousand, seventy-one".