19928761954 has 8 divisors (see below), whose sum is σ = 29906096220. Its totient is φ = 9960063216.

The previous prime is 19928761913. The next prime is 19928761961. The reversal of 19928761954 is 45916782991.

It can be written as a sum of positive squares in 2 ways, for example, as 16326961729 + 3601800225 = 127777^2 + 60015^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 19928761892 and 19928761901.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2153109 + ... + 2162344.

Almost surely, 2^19928761954 is an apocalyptic number.

19928761954 is a deficient number, since it is larger than the sum of its proper divisors (9977334266).

19928761954 is a wasteful number, since it uses less digits than its factorization.

19928761954 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4317764.

The product of its digits is 9797760, while the sum is 61.

The spelling of 19928761954 in words is "nineteen billion, nine hundred twenty-eight million, seven hundred sixty-one thousand, nine hundred fifty-four".