20200000042 has 4 divisors (see below), whose sum is σ = 30300000066. Its totient is φ = 10100000020.

The previous prime is 20200000019. The next prime is 20200000091. The reversal of 20200000042 is 24000000202.

It is a happy number.

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., 16273849761 + 3926150281 = 127569^2 + 62659^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20199999974 and 20200000028.

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 as a sum of consecutive naturals, namely, 5050000009 + ... + 5050000012.

Almost surely, 2^20200000042 is an apocalyptic number.

20200000042 is a deficient number, since it is larger than the sum of its proper divisors (10100000024).

20200000042 is a wasteful number, since it uses less digits than its factorization.

20200000042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10100000023.

The product of its (nonzero) digits is 32, while the sum is 10.

Adding to 20200000042 its reverse (24000000202), we get a palindrome (44200000244).

The spelling of 20200000042 in words is "twenty billion, two hundred million, forty-two", and thus it is an aban number.