20881246064 has 40 divisors (see below), whose sum is σ = 48956875488. Its totient is φ = 8422686720.

The previous prime is 20881246027. The next prime is 20881246079. The reversal of 20881246064 is 46064218802.

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, 5481617 + ... + 5485424.

Almost surely, 2^20881246064 is an apocalyptic number.

It is an amenable number.

20881246064 is an abundant number, since it is smaller than the sum of its proper divisors (28075629424).

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

20881246064 is a wasteful number, since it uses less digits than its factorization.

20881246064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10967073 (or 10967067 counting only the distinct ones).

The product of its (nonzero) digits is 147456, while the sum is 41.

The spelling of 20881246064 in words is "twenty billion, eight hundred eighty-one million, two hundred forty-six thousand, sixty-four".