20628549117 has 18 divisors (see below), whose sum is σ = 32751848766. Its totient is φ = 12502150320.

The previous prime is 20628549113. The next prime is 20628549127. The reversal of 20628549117 is 71194582602.

20628549117 is a `hidden beast` number, since 2 + 0 + 628 + 5 + 4 + 9 + 1 + 17 = 666.

It can be written as a sum of positive squares in only one way, i.e., 14129125956 + 6499423161 = 118866^2 + 80619^2 .

It is not a de Polignac number, because 20628549117 - 2² = 20628549113 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20628549113) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 9470238 + ... + 9472415.

Almost surely, 2^20628549117 is an apocalyptic number.

It is an amenable number.

20628549117 is a deficient number, since it is larger than the sum of its proper divisors (12123299649).

20628549117 is a wasteful number, since it uses less digits than its factorization.

20628549117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18942681 (or 18942667 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The spelling of 20628549117 in words is "twenty billion, six hundred twenty-eight million, five hundred forty-nine thousand, one hundred seventeen".