20504255918 has 8 divisors (see below), whose sum is σ = 30998560512. Its totient is φ = 10171402416.

The previous prime is 20504255911. The next prime is 20504255939. The reversal of 20504255918 is 81955240502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20504255911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40362455 + ... + 40362962.

It is an arithmetic number, because the mean of its divisors is an integer number (3874820064).

Almost surely, 2^20504255918 is an apocalyptic number.

20504255918 is a deficient number, since it is larger than the sum of its proper divisors (10494304594).

20504255918 is a wasteful number, since it uses less digits than its factorization.

20504255918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80725546.

The product of its (nonzero) digits is 144000, while the sum is 41.

The spelling of 20504255918 in words is "twenty billion, five hundred four million, two hundred fifty-five thousand, nine hundred eighteen".