20772257 has 8 divisors (see below), whose sum is σ = 22980672. Its totient is φ = 18617200.

The previous prime is 20772251. The next prime is 20772293. The reversal of 20772257 is 75227702.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20772257 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20772251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12518 + ... + 14079.

It is an arithmetic number, because the mean of its divisors is an integer number (2872584).

Almost surely, 2^20772257 is an apocalyptic number.

It is an amenable number.

20772257 is a deficient number, since it is larger than the sum of its proper divisors (2208415).

20772257 is a wasteful number, since it uses less digits than its factorization.

20772257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26679.

The product of its (nonzero) digits is 13720, while the sum is 32.

The square root of 20772257 is about 4557.6591579450. The cubic root of 20772257 is about 274.8914480656.

Adding to 20772257 its reverse (75227702), we get a palindrome (95999959).

Subtracting 20772257 from its reverse (75227702), we obtain a palindrome (54455445).

It can be divided in two parts, 2077 and 2257, that added together give a palindrome (4334).

The spelling of 20772257 in words is "twenty million, seven hundred seventy-two thousand, two hundred fifty-seven".