20045512042 has 4 divisors (see below), whose sum is σ = 30068268066. Its totient is φ = 10022756020.

The previous prime is 20045512027. The next prime is 20045512093. The reversal of 20045512042 is 24021554002.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 11344167081 + 8701344961 = 106509^2 + 93281^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20045511998 and 20045512016.

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, 5011378009 + ... + 5011378012.

Almost surely, 2^20045512042 is an apocalyptic number.

20045512042 is a deficient number, since it is larger than the sum of its proper divisors (10022756024).

20045512042 is a wasteful number, since it uses less digits than its factorization.

20045512042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10022756023.

The product of its (nonzero) digits is 3200, while the sum is 25.

The spelling of 20045512042 in words is "twenty billion, forty-five million, five hundred twelve thousand, forty-two".