20640874626 has 32 divisors (see below), whose sum is σ = 46449235200. Its totient is φ = 6793197840.

The previous prime is 20640874621. The next prime is 20640874633. The reversal of 20640874626 is 62647804602.

It is not an unprimeable number, because it can be changed into a prime (20640874621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2414965 + ... + 2423496.

It is an arithmetic number, because the mean of its divisors is an integer number (1451538600).

Almost surely, 2^20640874626 is an apocalyptic number.

20640874626 is an abundant number, since it is smaller than the sum of its proper divisors (25808360574).

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

20640874626 is a wasteful number, since it uses less digits than its factorization.

20640874626 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4838551 (or 4838545 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 45.

The spelling of 20640874626 in words is "twenty billion, six hundred forty million, eight hundred seventy-four thousand, six hundred twenty-six".