20640626000 has 40 divisors (see below), whose sum is σ = 49909038504. Its totient is φ = 8256249600.

The previous prime is 20640625979. The next prime is 20640626033. The reversal of 20640626000 is 62604602.

It can be written as a sum of positive squares in 4 ways, for example, as 3579664 + 20637046336 = 1892^2 + 143656^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5158157 + ... + 5162156.

Almost surely, 2^20640626000 is an apocalyptic number.

20640626000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20640626000 is an abundant number, since it is smaller than the sum of its proper divisors (29268412504).

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

20640626000 is a wasteful number, since it uses less digits than its factorization.

20640626000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10320336 (or 10320320 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 26.

The spelling of 20640626000 in words is "twenty billion, six hundred forty million, six hundred twenty-six thousand".