20722163 has 16 divisors (see below), whose sum is σ = 25989120. Its totient is φ = 16051200.

The previous prime is 20722129. The next prime is 20722171. The reversal of 20722163 is 36122702.

It is not a de Polignac number, because 20722163 - 2⁸ = 20721907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20722123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14003 + ... + 15411.

It is an arithmetic number, because the mean of its divisors is an integer number (1624320).

Almost surely, 2^20722163 is an apocalyptic number.

20722163 is a deficient number, since it is larger than the sum of its proper divisors (5266957).

20722163 is a wasteful number, since it uses less digits than its factorization.

20722163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1618.

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 20722163 is about 4552.1602564057. The cubic root of 20722163 is about 274.6702957766.

Adding to 20722163 its reverse (36122702), we get a palindrome (56844865).

The spelling of 20722163 in words is "twenty million, seven hundred twenty-two thousand, one hundred sixty-three".