20770000639 has 4 divisors (see below), whose sum is σ = 20806892856. Its totient is φ = 20733108424.

The previous prime is 20770000637. The next prime is 20770000649. The reversal of 20770000639 is 93600007702.

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 20770000639 - 2¹ = 20770000637 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 (20770000637) 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, 18445264 + ... + 18446389.

It is an arithmetic number, because the mean of its divisors is an integer number (5201723214).

Almost surely, 2^20770000639 is an apocalyptic number.

20770000639 is a deficient number, since it is larger than the sum of its proper divisors (36892217).

20770000639 is an equidigital number, since it uses as much as digits as its factorization.

20770000639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36892216.

The product of its (nonzero) digits is 15876, while the sum is 34.

The spelling of 20770000639 in words is "twenty billion, seven hundred seventy million, six hundred thirty-nine", and thus it is an aban number.