20771893 has 4 divisors (see below), whose sum is σ = 20786220. Its totient is φ = 20757568.

The previous prime is 20771887. The next prime is 20771897. The reversal of 20771893 is 39817702.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1350244 + 19421649 = 1162^2 + 4407^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20771893 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 (20771897) 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, 4708 + ... + 7981.

It is an arithmetic number, because the mean of its divisors is an integer number (5196555).

Almost surely, 2^20771893 is an apocalyptic number.

It is an amenable number.

20771893 is a deficient number, since it is larger than the sum of its proper divisors (14327).

20771893 is a wasteful number, since it uses less digits than its factorization.

20771893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14326.

The product of its (nonzero) digits is 21168, while the sum is 37.

The square root of 20771893 is about 4557.6192249902. The cubic root of 20771893 is about 274.8898423811.

The spelling of 20771893 in words is "twenty million, seven hundred seventy-one thousand, eight hundred ninety-three".