20202340042 has 4 divisors (see below), whose sum is σ = 30303510066. Its totient is φ = 10101170020.

The previous prime is 20202340001. The next prime is 20202340051. The reversal of 20202340042 is 24004320202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24004320202 = 2 ⋅12002160101.

It can be written as a sum of positive squares in only one way, i.e., 20200652641 + 1687401 = 142129^2 + 1299^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5050585009 + ... + 5050585012.

Almost surely, 2^20202340042 is an apocalyptic number.

20202340042 is a deficient number, since it is larger than the sum of its proper divisors (10101170024).

20202340042 is a wasteful number, since it uses less digits than its factorization.

20202340042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10101170023.

The product of its (nonzero) digits is 768, while the sum is 19.

Adding to 20202340042 its reverse (24004320202), we get a palindrome (44206660244).

The spelling of 20202340042 in words is "twenty billion, two hundred two million, three hundred forty thousand, forty-two".