10820989 has 4 divisors (see below), whose sum is σ = 10839424. Its totient is φ = 10802556.

The previous prime is 10820981. The next prime is 10821001. The reversal of 10820989 is 98902801.

10820989 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 98902801 = 199 ⋅496999.

It is a cyclic number.

It is not a de Polignac number, because 10820989 - 2³ = 10820981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10820981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8307 + ... + 9520.

It is an arithmetic number, because the mean of its divisors is an integer number (2709856).

Almost surely, 2^10820989 is an apocalyptic number.

It is an amenable number.

10820989 is a deficient number, since it is larger than the sum of its proper divisors (18435).

10820989 is an equidigital number, since it uses as much as digits as its factorization.

10820989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18434.

The product of its (nonzero) digits is 10368, while the sum is 37.

The square root of 10820989 is about 3289.5271696704. The cubic root of 10820989 is about 221.1849901034.

The spelling of 10820989 in words is "ten million, eight hundred twenty thousand, nine hundred eighty-nine".