20975135 has 4 divisors (see below), whose sum is σ = 25170168. Its totient is φ = 16780104.

The previous prime is 20975131. The next prime is 20975137. The reversal of 20975135 is 53157902.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20975135 - 2² = 20975131 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20975131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2097509 + ... + 2097518.

It is an arithmetic number, because the mean of its divisors is an integer number (6292542).

Almost surely, 2^20975135 is an apocalyptic number.

20975135 is a deficient number, since it is larger than the sum of its proper divisors (4195033).

20975135 is an equidigital number, since it uses as much as digits as its factorization.

20975135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4195032.

The product of its (nonzero) digits is 9450, while the sum is 32.

The square root of 20975135 is about 4579.8618974812. The cubic root of 20975135 is about 275.7834847128.

The spelling of 20975135 in words is "twenty million, nine hundred seventy-five thousand, one hundred thirty-five".