20951087 has 2 divisors, whose sum is σ = 20951088. Its totient is φ = 20951086.

The previous prime is 20951083. The next prime is 20951107. The reversal of 20951087 is 78015902.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20951087 - 2² = 20951083 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20951083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10475543 + 10475544.

It is an arithmetic number, because the mean of its divisors is an integer number (10475544).

Almost surely, 2^20951087 is an apocalyptic number.

20951087 is a deficient number, since it is larger than the sum of its proper divisors (1).

20951087 is an equidigital number, since it uses as much as digits as its factorization.

20951087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5040, while the sum is 32.

The square root of 20951087 is about 4577.2357378663. The cubic root of 20951087 is about 275.6780491196.

Adding to 20951087 its reverse (78015902), we get a palindrome (98966989).

The spelling of 20951087 in words is "twenty million, nine hundred fifty-one thousand, eighty-seven".