20713125277 has 4 divisors (see below), whose sum is σ = 22306442620. Its totient is φ = 19119807936.

The previous prime is 20713125269. The next prime is 20713125283. The reversal of 20713125277 is 77252131702.

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 1388233081 + 19324892196 = 37259^2 + 139014^2 .

It is a cyclic number.

It is not a de Polignac number, because 20713125277 - 2³ = 20713125269 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 (20713125217) 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, 796658652 + ... + 796658677.

It is an arithmetic number, because the mean of its divisors is an integer number (5576610655).

Almost surely, 2^20713125277 is an apocalyptic number.

It is an amenable number.

20713125277 is a deficient number, since it is larger than the sum of its proper divisors (1593317343).

20713125277 is a wasteful number, since it uses less digits than its factorization.

20713125277 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1593317342.

The product of its (nonzero) digits is 41160, while the sum is 37.

Adding to 20713125277 its reverse (77252131702), we get a palindrome (97965256979).

The spelling of 20713125277 in words is "twenty billion, seven hundred thirteen million, one hundred twenty-five thousand, two hundred seventy-seven".