20513174156 has 12 divisors (see below), whose sum is σ = 36233551368.
Its totient is φ = 10160730912.
The previous prime is 20513174141. The next prime is 20513174159. The reversal of 20513174156 is 65147131502.
It is a happy number.
It is not an unprimeable number, because it can be changed into a prime (20513174159) 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, 23963561 + ... + 23964416.
It is an arithmetic number, because the mean of its divisors is an integer number (3019462614).
Almost surely, 220513174156 is an apocalyptic number.
It is an amenable number.
20513174156 is a deficient number, since it is larger than the sum of its proper divisors (15720377212).
20513174156 is a wasteful number, since it uses less digits than its factorization.
20513174156 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 47928088 (or 47928086 counting only the distinct ones).
The product of its (nonzero) digits is 25200, while the sum is 35.
The spelling of 20513174156 in words is "twenty billion, five hundred thirteen million, one hundred seventy-four thousand, one hundred fifty-six".