20870089 has 2 divisors, whose sum is σ = 20870090. Its totient is φ = 20870088.

The previous prime is 20870077. The next prime is 20870117. The reversal of 20870089 is 98007802.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16949689 + 3920400 = 4117^2 + 1980^2 .

It is a cyclic number.

It is not a de Polignac number, because 20870089 - 2²¹ = 18772937 is a prime.

It is a super-2 number, since 2×20870089² = 871121229735842, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20870389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10435044 + 10435045.

It is an arithmetic number, because the mean of its divisors is an integer number (10435045).

Almost surely, 2^20870089 is an apocalyptic number.

It is an amenable number.

20870089 is a deficient number, since it is larger than the sum of its proper divisors (1).

20870089 is an equidigital number, since it uses as much as digits as its factorization.

20870089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 34.

The square root of 20870089 is about 4568.3792530831. The cubic root of 20870089 is about 275.3223283863.

The spelling of 20870089 in words is "twenty million, eight hundred seventy thousand, eighty-nine".