20510042 has 16 divisors (see below), whose sum is σ = 35234880. Its totient is φ = 8771328.

The previous prime is 20510027. The next prime is 20510053. The reversal of 20510042 is 24001502.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 20509999 and 20510026.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6809 + ... + 9347.

It is an arithmetic number, because the mean of its divisors is an integer number (2202180).

Almost surely, 2^20510042 is an apocalyptic number.

20510042 is a deficient number, since it is larger than the sum of its proper divisors (14724838).

20510042 is a wasteful number, since it uses less digits than its factorization.

20510042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3125.

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 20510042 is about 4528.8013866806. The cubic root of 20510042 is about 273.7298650078.

Adding to 20510042 its reverse (24001502), we get a palindrome (44511544).

The spelling of 20510042 in words is "twenty million, five hundred ten thousand, forty-two".