20772081 has 12 divisors (see below), whose sum is σ = 32731920. Its totient is φ = 12589080.

The previous prime is 20772067. The next prime is 20772107. The reversal of 20772081 is 18027702.

It is not a de Polignac number, because 20772081 - 2⁵ = 20772049 is a prime.

It is a super-2 number, since 2×20772081² = 862958698141122, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20772041) 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, 104811 + ... + 105008.

It is an arithmetic number, because the mean of its divisors is an integer number (2727660).

Almost surely, 2^20772081 is an apocalyptic number.

It is an amenable number.

20772081 is a deficient number, since it is larger than the sum of its proper divisors (11959839).

20772081 is a wasteful number, since it uses less digits than its factorization.

20772081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209836 (or 209833 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 27.

The square root of 20772081 is about 4557.6398497468. The cubic root of 20772081 is about 274.8906716930.

Adding to 20772081 its reverse (18027702), we get a palindrome (38799783).

The spelling of 20772081 in words is "twenty million, seven hundred seventy-two thousand, eighty-one".