20445669836 has 12 divisors (see below), whose sum is σ = 35797113912. Its totient is φ = 10217923008.

The previous prime is 20445669833. The next prime is 20445669863. The reversal of 20445669836 is 63896654402.

It is not an unprimeable number, because it can be changed into a prime (20445669833) 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, 1218605 + ... + 1235268.

It is an arithmetic number, because the mean of its divisors is an integer number (2983092826).

Almost surely, 2^20445669836 is an apocalyptic number.

It is an amenable number.

20445669836 is a deficient number, since it is larger than the sum of its proper divisors (15351444076).

20445669836 is a wasteful number, since it uses less digits than its factorization.

20445669836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2455960 (or 2455958 counting only the distinct ones).

The product of its (nonzero) digits is 7464960, while the sum is 53.

The spelling of 20445669836 in words is "twenty billion, four hundred forty-five million, six hundred sixty-nine thousand, eight hundred thirty-six".