20612771 has 4 divisors (see below), whose sum is σ = 20962200. Its totient is φ = 20263344.

The previous prime is 20612747. The next prime is 20612797. The reversal of 20612771 is 17721602.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20612771 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20612771.

It is not an unprimeable number, because it can be changed into a prime (20612741) 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, 174626 + ... + 174743.

It is an arithmetic number, because the mean of its divisors is an integer number (5240550).

Almost surely, 2^20612771 is an apocalyptic number.

20612771 is a deficient number, since it is larger than the sum of its proper divisors (349429).

20612771 is an equidigital number, since it uses as much as digits as its factorization.

20612771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 349428.

The product of its (nonzero) digits is 1176, while the sum is 26.

The square root of 20612771 is about 4540.1289629261. The cubic root of 20612771 is about 274.1861159366.

The spelling of 20612771 in words is "twenty million, six hundred twelve thousand, seven hundred seventy-one".