20640547050 has 24 divisors (see below), whose sum is σ = 51188557056. Its totient is φ = 5504145840.

The previous prime is 20640547043. The next prime is 20640547097. The reversal of 20640547050 is 5074504602.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 68801674 + ... + 68801973.

It is an arithmetic number, because the mean of its divisors is an integer number (2132856544).

Almost surely, 2^20640547050 is an apocalyptic number.

20640547050 is an abundant number, since it is smaller than the sum of its proper divisors (30548010006).

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

20640547050 is a wasteful number, since it uses less digits than its factorization.

20640547050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137603662 (or 137603657 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 33.

The spelling of 20640547050 in words is "twenty billion, six hundred forty million, five hundred forty-seven thousand, fifty".