20641806264 has 64 divisors (see below), whose sum is σ = 54446515200. Its totient is φ = 6503348736.

The previous prime is 20641806259. The next prime is 20641806271. The reversal of 20641806264 is 46260814602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 145177 + ... + 249719.

It is an arithmetic number, because the mean of its divisors is an integer number (850726800).

Almost surely, 2^20641806264 is an apocalyptic number.

20641806264 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20641806264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27223257600).

20641806264 is an abundant number, since it is smaller than the sum of its proper divisors (33804708936).

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

20641806264 is a wasteful number, since it uses less digits than its factorization.

20641806264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105004 (or 105000 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 39.

The spelling of 20641806264 in words is "twenty billion, six hundred forty-one million, eight hundred six thousand, two hundred sixty-four".