20000000042 has 8 divisors (see below), whose sum is σ = 32727272832. Its totient is φ = 9090909100.

The previous prime is 19999999967. The next prime is 20000000089. The reversal of 20000000042 is 24000000002.

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

It is a junction number, because it is equal to n+sod(n) for n = 19999999957 and 20000000029.

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, 454545434 + ... + 454545477.

It is an arithmetic number, because the mean of its divisors is an integer number (4090909104).

Almost surely, 2^20000000042 is an apocalyptic number.

20000000042 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20000000042 is a deficient number, since it is larger than the sum of its proper divisors (12727272790).

20000000042 is a wasteful number, since it uses less digits than its factorization.

20000000042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 909090924.

The product of its (nonzero) digits is 16, while the sum is 8.

Adding to 20000000042 its reverse (24000000002), we get a palindrome (44000000044).

The spelling of 20000000042 in words is "twenty billion, forty-two", and thus it is an aban number and an uban number.