20636331 has 4 divisors (see below), whose sum is σ = 27515112. Its totient is φ = 13757552.

The previous prime is 20636327. The next prime is 20636333. The reversal of 20636331 is 13363602.

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 20636331 - 2² = 20636327 is a prime.

It is a super-2 number, since 2×20636331² = 851716314283122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20636333) 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, 3439386 + ... + 3439391.

It is an arithmetic number, because the mean of its divisors is an integer number (6878778).

Almost surely, 2^20636331 is an apocalyptic number.

20636331 is a deficient number, since it is larger than the sum of its proper divisors (6878781).

20636331 is an equidigital number, since it uses as much as digits as its factorization.

20636331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6878780.

The product of its (nonzero) digits is 1944, while the sum is 24.

The square root of 20636331 is about 4542.7228618968. The cubic root of 20636331 is about 274.2905393109.

Adding to 20636331 its reverse (13363602), we get a palindrome (33999933).

The spelling of 20636331 in words is "twenty million, six hundred thirty-six thousand, three hundred thirty-one".