20636229 has 4 divisors (see below), whose sum is σ = 27514976. Its totient is φ = 13757484.

The previous prime is 20636227. The next prime is 20636251. The reversal of 20636229 is 92263602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 20636229 - 2¹ = 20636227 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20636196 and 20636205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20636227) 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, 3439369 + ... + 3439374.

It is an arithmetic number, because the mean of its divisors is an integer number (6878744).

Almost surely, 2^20636229 is an apocalyptic number.

It is an amenable number.

20636229 is a deficient number, since it is larger than the sum of its proper divisors (6878747).

20636229 is an equidigital number, since it uses as much as digits as its factorization.

20636229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6878746.

The product of its (nonzero) digits is 7776, while the sum is 30.

The square root of 20636229 is about 4542.7116351360. The cubic root of 20636229 is about 274.2900873946.

The spelling of 20636229 in words is "twenty million, six hundred thirty-six thousand, two hundred twenty-nine".