20519172608 has 80 divisors (see below), whose sum is σ = 44784026496. Its totient is φ = 9314672640.

The previous prime is 20519172523. The next prime is 20519172629. The reversal of 20519172608 is 80627191502.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5365385 + ... + 5369207.

Almost surely, 2^20519172608 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20519172608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22392013248).

20519172608 is an abundant number, since it is smaller than the sum of its proper divisors (24264853888).

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

20519172608 is an equidigital number, since it uses as much as digits as its factorization.

20519172608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4805 (or 4789 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 41.

The spelling of 20519172608 in words is "twenty billion, five hundred nineteen million, one hundred seventy-two thousand, six hundred eight".