20640406054 has 16 divisors (see below), whose sum is σ = 31615518528. Its totient is φ = 10103790312.

The previous prime is 20640406009. The next prime is 20640406067. The reversal of 20640406054 is 45060404602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 450652 + ... + 494335.

It is an arithmetic number, because the mean of its divisors is an integer number (1975969908).

Almost surely, 2^20640406054 is an apocalyptic number.

20640406054 is a deficient number, since it is larger than the sum of its proper divisors (10975112474).

20640406054 is a wasteful number, since it uses less digits than its factorization.

20640406054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 945219.

The product of its (nonzero) digits is 23040, while the sum is 31.

The spelling of 20640406054 in words is "twenty billion, six hundred forty million, four hundred six thousand, fifty-four".