20642235 has 16 divisors (see below), whose sum is σ = 33123840. Its totient is φ = 10977120.

The previous prime is 20642213. The next prime is 20642239. The reversal of 20642235 is 53224602.

It is not a de Polignac number, because 20642235 - 2¹⁰ = 20641211 is a prime.

It is a super-2 number, since 2×20642235² = 852203731590450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20642239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3870 + ... + 7500.

It is an arithmetic number, because the mean of its divisors is an integer number (2070240).

Almost surely, 2^20642235 is an apocalyptic number.

20642235 is a deficient number, since it is larger than the sum of its proper divisors (12481605).

20642235 is a wasteful number, since it uses less digits than its factorization.

20642235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4018.

The product of its (nonzero) digits is 2880, while the sum is 24.

The square root of 20642235 is about 4543.3726459537. The cubic root of 20642235 is about 274.3166947506.

Adding to 20642235 its reverse (53224602), we get a palindrome (73866837).

The spelling of 20642235 in words is "twenty million, six hundred forty-two thousand, two hundred thirty-five".