20405038672 has 40 divisors (see below), whose sum is σ = 40500059616. Its totient is φ = 9956259456.

The previous prime is 20405038649. The next prime is 20405038697. The reversal of 20405038672 is 27683050402.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 25758 + ... + 203650.

Almost surely, 2^20405038672 is an apocalyptic number.

It is an amenable number.

20405038672 is a deficient number, since it is larger than the sum of its proper divisors (20095020944).

20405038672 is a wasteful number, since it uses less digits than its factorization.

20405038672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178075 (or 178069 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 37.

The spelling of 20405038672 in words is "twenty billion, four hundred five million, thirty-eight thousand, six hundred seventy-two".