20952081 has 8 divisors (see below), whose sum is σ = 31040160. Its totient is φ = 13968036.

The previous prime is 20952077. The next prime is 20952091. The reversal of 20952081 is 18025902.

It is not a de Polignac number, because 20952081 - 2² = 20952077 is a prime.

It is a super-2 number, since 2×20952081² = 877979396461122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 776003 = 20952081 / (2 + 0 + 9 + 5 + 2 + 0 + 8 + 1).

It is not an unprimeable number, because it can be changed into a prime (20952091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 387975 + ... + 388028.

It is an arithmetic number, because the mean of its divisors is an integer number (3880020).

Almost surely, 2^20952081 is an apocalyptic number.

It is an amenable number.

20952081 is a deficient number, since it is larger than the sum of its proper divisors (10088079).

20952081 is an equidigital number, since it uses as much as digits as its factorization.

20952081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 776012 (or 776006 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 20952081 is about 4577.3443173963. The cubic root of 20952081 is about 275.6824087923.

Adding to 20952081 its reverse (18025902), we get a palindrome (38977983).

The spelling of 20952081 in words is "twenty million, nine hundred fifty-two thousand, eighty-one".