20420111242 has 12 divisors (see below), whose sum is σ = 31140543798. Its totient is φ = 10042674000.

The previous prime is 20420111233. The next prime is 20420111251. The reversal of 20420111242 is 24211102402.

It is an interprime number because it is at equal distance from previous prime (20420111233) and next prime (20420111251).

It can be written as a sum of positive squares in 3 ways, for example, as 2974720681 + 17445390561 = 54541^2 + 132081^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1364509 + ... + 1379392.

Almost surely, 2^20420111242 is an apocalyptic number.

20420111242 is a deficient number, since it is larger than the sum of its proper divisors (10720432556).

20420111242 is an equidigital number, since it uses as much as digits as its factorization.

20420111242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2744025 (or 2743964 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 20420111242 its reverse (24211102402), we get a palindrome (44631213644).

The spelling of 20420111242 in words is "twenty billion, four hundred twenty million, one hundred eleven thousand, two hundred forty-two".