20408185964 has 12 divisors (see below), whose sum is σ = 35870284800. Its totient is φ = 10159533168.

The previous prime is 20408185961. The next prime is 20408185991. The reversal of 20408185964 is 46958180402.

It is not an unprimeable number, because it can be changed into a prime (20408185961) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11138924 + ... + 11140755.

It is an arithmetic number, because the mean of its divisors is an integer number (2989190400).

Almost surely, 2^20408185964 is an apocalyptic number.

It is an amenable number.

20408185964 is a deficient number, since it is larger than the sum of its proper divisors (15462098836).

20408185964 is a wasteful number, since it uses less digits than its factorization.

20408185964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22279912 (or 22279910 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 47.

The spelling of 20408185964 in words is "twenty billion, four hundred eight million, one hundred eighty-five thousand, nine hundred sixty-four".