20809004920 has 32 divisors (see below), whose sum is σ = 51076649520. Its totient is φ = 7566910720.

The previous prime is 20809004891. The next prime is 20809004933. The reversal of 20809004920 is 2940090802.

It is a congruent number.

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, 23646157 + ... + 23647036.

Almost surely, 2^20809004920 is an apocalyptic number.

20809004920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20809004920 is an abundant number, since it is smaller than the sum of its proper divisors (30267644600).

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

20809004920 is a wasteful number, since it uses less digits than its factorization.

20809004920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47293215 (or 47293211 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 34.

The spelling of 20809004920 in words is "twenty billion, eight hundred nine million, four thousand, nine hundred twenty".