20019920904 has 64 divisors (see below), whose sum is σ = 55639857600. Its totient is φ = 6669831168.

The previous prime is 20019920867. The next prime is 20019920909. The reversal of 20019920904 is 40902991002.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (20019920909) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 409512 + ... + 455784.

It is an arithmetic number, because the mean of its divisors is an integer number (869372775).

Almost surely, 2^20019920904 is an apocalyptic number.

20019920904 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20019920904 is an abundant number, since it is smaller than the sum of its proper divisors (35619936696).

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

20019920904 is a wasteful number, since it uses less digits than its factorization.

20019920904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48291 (or 48281 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The spelling of 20019920904 in words is "twenty billion, nineteen million, nine hundred twenty thousand, nine hundred four".