20945087 has 8 divisors (see below), whose sum is σ = 22350960. Its totient is φ = 19569600.

The previous prime is 20945083. The next prime is 20945101. The reversal of 20945087 is 78054902.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20945087 - 2² = 20945083 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20945081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6164 + ... + 8937.

It is an arithmetic number, because the mean of its divisors is an integer number (2793870).

Almost surely, 2^20945087 is an apocalyptic number.

20945087 is a deficient number, since it is larger than the sum of its proper divisors (1405873).

20945087 is a wasteful number, since it uses less digits than its factorization.

20945087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15193.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 20945087 is about 4576.5802735230. The cubic root of 20945087 is about 275.6517302590.

Adding to 20945087 its reverse (78054902), we get a palindrome (98999989).

The spelling of 20945087 in words is "twenty million, nine hundred forty-five thousand, eighty-seven".