20609805384 has 48 divisors (see below), whose sum is σ = 63792256320. Its totient is φ = 5888515680.

The previous prime is 20609805371. The next prime is 20609805389. The reversal of 20609805384 is 48350890602.

20609805384 is a `hidden beast` number, since 2 + 0 + 609 + 8 + 0 + 5 + 38 + 4 = 666.

It is not an unprimeable number, because it can be changed into a prime (20609805389) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20445732 + ... + 20446739.

It is an arithmetic number, because the mean of its divisors is an integer number (1329005340).

Almost surely, 2^20609805384 is an apocalyptic number.

20609805384 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20609805384 is an abundant number, since it is smaller than the sum of its proper divisors (43182450936).

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

20609805384 is a wasteful number, since it uses less digits than its factorization.

20609805384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40892490 (or 40892483 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The spelling of 20609805384 in words is "twenty billion, six hundred nine million, eight hundred five thousand, three hundred eighty-four".