20023135 has 16 divisors (see below), whose sum is σ = 26710560. Its totient is φ = 14285440.

The previous prime is 20023121. The next prime is 20023139. The reversal of 20023135 is 53132002.

It is a de Polignac number, because none of the positive numbers 2^k-20023135 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20023139) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 520 + ... + 6349.

It is an arithmetic number, because the mean of its divisors is an integer number (1669410).

Almost surely, 2^20023135 is an apocalyptic number.

20023135 is a deficient number, since it is larger than the sum of its proper divisors (6687425).

20023135 is a wasteful number, since it uses less digits than its factorization.

20023135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6938.

The product of its (nonzero) digits is 180, while the sum is 16.

The square root of 20023135 is about 4474.7217790607. The cubic root of 20023135 is about 271.5463847482.

Adding to 20023135 its reverse (53132002), we get a palindrome (73155137).

The spelling of 20023135 in words is "twenty million, twenty-three thousand, one hundred thirty-five".