20663087 has 2 divisors, whose sum is σ = 20663088. Its totient is φ = 20663086.

The previous prime is 20663053. The next prime is 20663107. The reversal of 20663087 is 78036602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20663087 - 2²² = 16468783 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20663017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10331543 + 10331544.

It is an arithmetic number, because the mean of its divisors is an integer number (10331544).

Almost surely, 2^20663087 is an apocalyptic number.

20663087 is a deficient number, since it is larger than the sum of its proper divisors (1).

20663087 is an equidigital number, since it uses as much as digits as its factorization.

20663087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 20663087 is about 4545.6668377698. Note that the first 3 decimals coincide. The cubic root of 20663087 is about 274.4090317599.

Adding to 20663087 its reverse (78036602), we get a palindrome (98699689).

The spelling of 20663087 in words is "twenty million, six hundred sixty-three thousand, eighty-seven".