20513551000 has 32 divisors (see below), whose sum is σ = 48001711680. Its totient is φ = 8205420000.

The previous prime is 20513550991. The next prime is 20513551087. The reversal of 20513551000 is 15531502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10255776 + ... + 10257775.

It is an arithmetic number, because the mean of its divisors is an integer number (1500053490).

Almost surely, 2^20513551000 is an apocalyptic number.

20513551000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20513551000 is an abundant number, since it is smaller than the sum of its proper divisors (27488160680).

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

20513551000 is a wasteful number, since it uses less digits than its factorization.

20513551000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20513572 (or 20513558 counting only the distinct ones).

The product of its (nonzero) digits is 750, while the sum is 22.

The spelling of 20513551000 in words is "twenty billion, five hundred thirteen million, five hundred fifty-one thousand".