20217859904 has 56 divisors (see below), whose sum is σ = 44698359168. Its totient is φ = 8994391040.

The previous prime is 20217859889. The next prime is 20217859913. The reversal of 20217859904 is 40995871202.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a congruent number.

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, 272429 + ... + 338604.

Almost surely, 2^20217859904 is an apocalyptic number.

It is an amenable number.

20217859904 is an abundant number, since it is smaller than the sum of its proper divisors (24480499264).

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

20217859904 is a wasteful number, since it uses less digits than its factorization.

20217859904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 611103 (or 611093 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 47.

The spelling of 20217859904 in words is "twenty billion, two hundred seventeen million, eight hundred fifty-nine thousand, nine hundred four".