20513809200 has 60 divisors (see below), whose sum is σ = 65712572648. Its totient is φ = 5470348800.

The previous prime is 20513809177. The next prime is 20513809207. The reversal of 20513809200 is 290831502.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (20513809207) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8546221 + ... + 8548620.

Almost surely, 2^20513809200 is an apocalyptic number.

20513809200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20513809200 is an abundant number, since it is smaller than the sum of its proper divisors (45198763448).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20513809200 is a wasteful number, since it uses less digits than its factorization.

20513809200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17094862 (or 17094851 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 30.

The spelling of 20513809200 in words is "twenty billion, five hundred thirteen million, eight hundred nine thousand, two hundred".