20047472542 has 4 divisors (see below), whose sum is σ = 30071208816. Its totient is φ = 10023736270.

The previous prime is 20047472521. The next prime is 20047472573. The reversal of 20047472542 is 24527474002.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24527474002 = 2 ⋅12263737001.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5011868134 + ... + 5011868137.

It is an arithmetic number, because the mean of its divisors is an integer number (7517802204).

Almost surely, 2^20047472542 is an apocalyptic number.

20047472542 is a deficient number, since it is larger than the sum of its proper divisors (10023736274).

20047472542 is a wasteful number, since it uses less digits than its factorization.

20047472542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10023736273.

The product of its (nonzero) digits is 125440, while the sum is 37.

The spelling of 20047472542 in words is "twenty billion, forty-seven million, four hundred seventy-two thousand, five hundred forty-two".