20764225 has 12 divisors (see below), whose sum is σ = 27262764. Its totient is φ = 15633920.

The previous prime is 20764223. The next prime is 20764229. The reversal of 20764225 is 52246702.

It can be written as a sum of positive squares in 6 ways, for example, as 2862864 + 17901361 = 1692^2 + 4231^2 .

It is not a de Polignac number, because 20764225 - 2¹ = 20764223 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20764193 and 20764202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20764223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24004 + ... + 24853.

It is an arithmetic number, because the mean of its divisors is an integer number (2271897).

Almost surely, 2^20764225 is an apocalyptic number.

20764225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20764225 is a deficient number, since it is larger than the sum of its proper divisors (6498539).

20764225 is a wasteful number, since it uses less digits than its factorization.

20764225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48884 (or 48879 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 28.

The square root of 20764225 is about 4556.7779186614. Note that the first 3 decimals coincide. The cubic root of 20764225 is about 274.8560127772.

The spelling of 20764225 in words is "twenty million, seven hundred sixty-four thousand, two hundred twenty-five".