20024989 has 2 divisors, whose sum is σ = 20024990. Its totient is φ = 20024988.

The previous prime is 20024987. The next prime is 20025001. The reversal of 20024989 is 98942002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19316025 + 708964 = 4395^2 + 842^2 .

It is a cyclic number.

It is not a de Polignac number, because 20024989 - 2¹ = 20024987 is a prime.

Together with 20024987, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20024981) 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 as a sum of consecutive naturals, namely, 10012494 + 10012495.

It is an arithmetic number, because the mean of its divisors is an integer number (10012495).

Almost surely, 2^20024989 is an apocalyptic number.

It is an amenable number.

20024989 is a deficient number, since it is larger than the sum of its proper divisors (1).

20024989 is an equidigital number, since it uses as much as digits as its factorization.

20024989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 20024989 is about 4474.9289379833. The cubic root of 20024989 is about 271.5547655780.

The spelling of 20024989 in words is "twenty million, twenty-four thousand, nine hundred eighty-nine".