20626687913 has 4 divisors (see below), whose sum is σ = 22213356228. Its totient is φ = 19040019600.

The previous prime is 20626687883. The next prime is 20626687927. The reversal of 20626687913 is 31978662602.

It is a happy number.

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 4565434624 + 16061253289 = 67568^2 + 126733^2 .

It is a cyclic number.

It is not a de Polignac number, because 20626687913 - 2⁸ = 20626687657 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20626687943) 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, 793334138 + ... + 793334163.

It is an arithmetic number, because the mean of its divisors is an integer number (5553339057).

Almost surely, 2^20626687913 is an apocalyptic number.

It is an amenable number.

20626687913 is a deficient number, since it is larger than the sum of its proper divisors (1586668315).

20626687913 is a wasteful number, since it uses less digits than its factorization.

20626687913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1586668314.

The product of its (nonzero) digits is 1306368, while the sum is 50.

The spelling of 20626687913 in words is "twenty billion, six hundred twenty-six million, six hundred eighty-seven thousand, nine hundred thirteen".