20400042242 has 8 divisors (see below), whose sum is σ = 31101703932. Its totient is φ = 10032807600.

The previous prime is 20400042239. The next prime is 20400042263. The reversal of 20400042242 is 24224000402.

It can be written as a sum of positive squares in 2 ways, for example, as 20277475201 + 122567041 = 142399^2 + 11071^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83606609 + ... + 83606852.

Almost surely, 2^20400042242 is an apocalyptic number.

20400042242 is a deficient number, since it is larger than the sum of its proper divisors (10701661690).

20400042242 is a wasteful number, since it uses less digits than its factorization.

20400042242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167213524.

The product of its (nonzero) digits is 1024, while the sum is 20.

Adding to 20400042242 its reverse (24224000402), we get a palindrome (44624042644).

The spelling of 20400042242 in words is "twenty billion, four hundred million, forty-two thousand, two hundred forty-two".