20989627 has 2 divisors, whose sum is σ = 20989628. Its totient is φ = 20989626.

The previous prime is 20989613. The next prime is 20989651. The reversal of 20989627 is 72698902.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20989627 - 2¹¹ = 20987579 is a prime.

It is not a weakly prime, because it can be changed into another prime (20989607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10494813 + 10494814.

It is an arithmetic number, because the mean of its divisors is an integer number (10494814).

Almost surely, 2^20989627 is an apocalyptic number.

20989627 is a deficient number, since it is larger than the sum of its proper divisors (1).

20989627 is an equidigital number, since it uses as much as digits as its factorization.

20989627 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 20989627 is about 4581.4437680714. The cubic root of 20989627 is about 275.8469842511.

The spelling of 20989627 in words is "twenty million, nine hundred eighty-nine thousand, six hundred twenty-seven".