20531135 has 4 divisors (see below), whose sum is σ = 24637368. Its totient is φ = 16424904.

The previous prime is 20531107. The next prime is 20531171. The reversal of 20531135 is 53113502.

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 20531135 - 2¹⁴ = 20514751 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2053109 + ... + 2053118.

It is an arithmetic number, because the mean of its divisors is an integer number (6159342).

Almost surely, 2^20531135 is an apocalyptic number.

20531135 is a deficient number, since it is larger than the sum of its proper divisors (4106233).

20531135 is an equidigital number, since it uses as much as digits as its factorization.

20531135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4106232.

The product of its (nonzero) digits is 450, while the sum is 20.

The square root of 20531135 is about 4531.1295501232. The cubic root of 20531135 is about 273.8236695593.

Adding to 20531135 its reverse (53113502), we get a palindrome (73644637).

The spelling of 20531135 in words is "twenty million, five hundred thirty-one thousand, one hundred thirty-five".