20022040042 has 4 divisors (see below), whose sum is σ = 30033060066. Its totient is φ = 10011020020.

The previous prime is 20022040019. The next prime is 20022040043. The reversal of 20022040042 is 24004022002.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24004022002 = 2 ⋅12002011001.

It can be written as a sum of positive squares in only one way, i.e., 20007819601 + 14220441 = 141449^2 + 3771^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20022039998 and 20022040025.

It is not an unprimeable number, because it can be changed into a prime (20022040043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5005510009 + ... + 5005510012.

Almost surely, 2^20022040042 is an apocalyptic number.

20022040042 is a deficient number, since it is larger than the sum of its proper divisors (10011020024).

20022040042 is a wasteful number, since it uses less digits than its factorization.

20022040042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10011020023.

The product of its (nonzero) digits is 256, while the sum is 16.

Adding to 20022040042 its reverse (24004022002), we get a palindrome (44026062044).

The spelling of 20022040042 in words is "twenty billion, twenty-two million, forty thousand, forty-two".