20289087 has 36 divisors (see below), whose sum is σ = 36723960. Its totient is φ = 10698912.

The previous prime is 20289053. The next prime is 20289091. The reversal of 20289087 is 78098202.

It is not a de Polignac number, because 20289087 - 2⁶ = 20289023 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20289187) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 3964 + ... + 7502.

It is an arithmetic number, because the mean of its divisors is an integer number (1020110).

Almost surely, 2^20289087 is an apocalyptic number.

20289087 is a deficient number, since it is larger than the sum of its proper divisors (16434873).

20289087 is a wasteful number, since it uses less digits than its factorization.

20289087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3572 (or 3562 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 20289087 is about 4504.3409062814. The cubic root of 20289087 is about 272.7433485372.

The spelling of 20289087 in words is "twenty million, two hundred eighty-nine thousand, eighty-seven".