20400242442 has 16 divisors (see below), whose sum is σ = 40810302912. Its totient is φ = 6798444480.

The previous prime is 20400242413. The next prime is 20400242453. The reversal of 20400242442 is 24424200402.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 381934 + ... + 432057.

It is an arithmetic number, because the mean of its divisors is an integer number (2550643932).

Almost surely, 2^20400242442 is an apocalyptic number.

20400242442 is an abundant number, since it is smaller than the sum of its proper divisors (20410060470).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20400242442 is a wasteful number, since it uses less digits than its factorization.

20400242442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 818173.

The product of its (nonzero) digits is 4096, while the sum is 24.

Adding to 20400242442 its reverse (24424200402), we get a palindrome (44824442844).

The spelling of 20400242442 in words is "twenty billion, four hundred million, two hundred forty-two thousand, four hundred forty-two".