20772163 has 4 divisors (see below), whose sum is σ = 20819920. Its totient is φ = 20724408.

The previous prime is 20772137. The next prime is 20772173. The reversal of 20772163 is 36127702.

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 20772163 - 2⁹ = 20771651 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20772173) 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, 23220 + ... + 24097.

It is an arithmetic number, because the mean of its divisors is an integer number (5204980).

Almost surely, 2^20772163 is an apocalyptic number.

20772163 is a deficient number, since it is larger than the sum of its proper divisors (47757).

20772163 is an equidigital number, since it uses as much as digits as its factorization.

20772163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47756.

The product of its (nonzero) digits is 3528, while the sum is 28.

The square root of 20772163 is about 4557.6488456220. The cubic root of 20772163 is about 274.8910334126.

Adding to 20772163 its reverse (36127702), we get a palindrome (56899865).

The spelling of 20772163 in words is "twenty million, seven hundred seventy-two thousand, one hundred sixty-three".