20042830 has 16 divisors (see below), whose sum is σ = 38199600. Its totient is φ = 7545472.

The previous prime is 20042801. The next prime is 20042837. The reversal of 20042830 is 3824002.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20042798 and 20042807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20042837) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58780 + ... + 59119.

It is an arithmetic number, because the mean of its divisors is an integer number (2387475).

Almost surely, 2^20042830 is an apocalyptic number.

20042830 is a deficient number, since it is larger than the sum of its proper divisors (18156770).

20042830 is a wasteful number, since it uses less digits than its factorization.

20042830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117923.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 20042830 is about 4476.9219336504. The cubic root of 20042830 is about 271.6353876860.

Adding to 20042830 its reverse (3824002), we get a palindrome (23866832).

The spelling of 20042830 in words is "twenty million, forty-two thousand, eight hundred thirty".