20420102242 has 4 divisors (see below), whose sum is σ = 30630153366. Its totient is φ = 10210051120.

The previous prime is 20420102207. The next prime is 20420102251. The reversal of 20420102242 is 24220102402.

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., 15617750841 + 4802351401 = 124971^2 + 69299^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5105025559 + ... + 5105025562.

Almost surely, 2^20420102242 is an apocalyptic number.

20420102242 is a deficient number, since it is larger than the sum of its proper divisors (10210051124).

20420102242 is a wasteful number, since it uses less digits than its factorization.

20420102242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10210051123.

The product of its (nonzero) digits is 512, while the sum is 19.

Adding to 20420102242 its reverse (24220102402), we get a palindrome (44640204644).

The spelling of 20420102242 in words is "twenty billion, four hundred twenty million, one hundred two thousand, two hundred forty-two".