20513554554 has 16 divisors (see below), whose sum is σ = 43186430880. Its totient is φ = 6477964560.

The previous prime is 20513554549. The next prime is 20513554583. The reversal of 20513554554 is 45545531502.

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, 89971617 + ... + 89971844.

It is an arithmetic number, because the mean of its divisors is an integer number (2699151930).

Almost surely, 2^20513554554 is an apocalyptic number.

20513554554 is an abundant number, since it is smaller than the sum of its proper divisors (22672876326).

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

20513554554 is a wasteful number, since it uses less digits than its factorization.

20513554554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179943485.

The product of its (nonzero) digits is 300000, while the sum is 39.

The spelling of 20513554554 in words is "twenty billion, five hundred thirteen million, five hundred fifty-four thousand, five hundred fifty-four".