20625229 has 4 divisors (see below), whose sum is σ = 20636284. Its totient is φ = 20614176.

The previous prime is 20625217. The next prime is 20625239. The reversal of 20625229 is 92252602.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 6749604 + 13875625 = 2598^2 + 3725^2 .

It is a cyclic number.

It is not a de Polignac number, because 20625229 - 2⁵ = 20625197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20625197 and 20625206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20625239) 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, 1962 + ... + 6715.

It is an arithmetic number, because the mean of its divisors is an integer number (5159071).

Almost surely, 2^20625229 is an apocalyptic number.

It is an amenable number.

20625229 is a deficient number, since it is larger than the sum of its proper divisors (11055).

20625229 is an equidigital number, since it uses as much as digits as its factorization.

20625229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11054.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 20625229 is about 4541.5007431465. The cubic root of 20625229 is about 274.2413425841.

The spelling of 20625229 in words is "twenty million, six hundred twenty-five thousand, two hundred twenty-nine".