20764039 has 2 divisors, whose sum is σ = 20764040. Its totient is φ = 20764038.

The previous prime is 20763991. The next prime is 20764049. The reversal of 20764039 is 93046702.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20764039 is a prime.

It is a super-2 number, since 2×20764039² = 862290631187042, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20764039.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20764049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10382019 + 10382020.

It is an arithmetic number, because the mean of its divisors is an integer number (10382020).

Almost surely, 2^20764039 is an apocalyptic number.

20764039 is a deficient number, since it is larger than the sum of its proper divisors (1).

20764039 is an equidigital number, since it uses as much as digits as its factorization.

20764039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 31.

The square root of 20764039 is about 4556.7575094578. The cubic root of 20764039 is about 274.8551920808.

It can be divided in two parts, 207 and 64039, that added together give a palindrome (64246).

The spelling of 20764039 in words is "twenty million, seven hundred sixty-four thousand, thirty-nine".