20675771 has 4 divisors (see below), whose sum is σ = 20685072. Its totient is φ = 20666472.

The previous prime is 20675761. The next prime is 20675779. The reversal of 20675771 is 17757602.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20675771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20675779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 866 + ... + 6488.

It is an arithmetic number, because the mean of its divisors is an integer number (5171268).

Almost surely, 2^20675771 is an apocalyptic number.

20675771 is a deficient number, since it is larger than the sum of its proper divisors (9301).

20675771 is an equidigital number, since it uses as much as digits as its factorization.

20675771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9300.

The product of its (nonzero) digits is 20580, while the sum is 35.

The square root of 20675771 is about 4547.0617985684. The cubic root of 20675771 is about 274.4651687772.

The spelling of 20675771 in words is "twenty million, six hundred seventy-five thousand, seven hundred seventy-one".