20439037928 has 8 divisors (see below), whose sum is σ = 38323196130. Its totient is φ = 10219518960.

The previous prime is 20439037901. The next prime is 20439037951. The reversal of 20439037928 is 82973093402.

It can be written as a sum of positive squares in only one way, i.e., 11651475364 + 8787562564 = 107942^2 + 93742^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1277439863 + ... + 1277439878.

Almost surely, 2^20439037928 is an apocalyptic number.

It is an amenable number.

20439037928 is a deficient number, since it is larger than the sum of its proper divisors (17884158202).

20439037928 is a wasteful number, since it uses less digits than its factorization.

20439037928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2554879747 (or 2554879743 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 47.

The spelling of 20439037928 in words is "twenty billion, four hundred thirty-nine million, thirty-seven thousand, nine hundred twenty-eight".