20640002060 has 48 divisors (see below), whose sum is σ = 44318461824. Its totient is φ = 8070805248.

The previous prime is 20640002059. The next prime is 20640002069. The reversal of 20640002060 is 6020004602.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (20640002069) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 811862 + ... + 836898.

It is an arithmetic number, because the mean of its divisors is an integer number (923301288).

Almost surely, 2^20640002060 is an apocalyptic number.

20640002060 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20640002060 is an abundant number, since it is smaller than the sum of its proper divisors (23678459764).

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

20640002060 is a wasteful number, since it uses less digits than its factorization.

20640002060 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25970 (or 25968 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 20640002060 its reverse (6020004602), we get a palindrome (26660006662).

The spelling of 20640002060 in words is "twenty billion, six hundred forty million, two thousand, sixty".