20966289 has 4 divisors (see below), whose sum is σ = 27955056. Its totient is φ = 13977524.

The previous prime is 20966279. The next prime is 20966357. The reversal of 20966289 is 98266902.

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.

It is a cyclic number.

It is not a de Polignac number, because 20966289 - 2⁴ = 20966273 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20966289.

It is not an unprimeable number, because it can be changed into a prime (20966279) 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, 3494379 + ... + 3494384.

It is an arithmetic number, because the mean of its divisors is an integer number (6988764).

Almost surely, 2^20966289 is an apocalyptic number.

It is an amenable number.

20966289 is a deficient number, since it is larger than the sum of its proper divisors (6988767).

20966289 is an equidigital number, since it uses as much as digits as its factorization.

20966289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6988766.

The product of its (nonzero) digits is 93312, while the sum is 42.

The square root of 20966289 is about 4578.8960459919. The cubic root of 20966289 is about 275.7447098533.

It can be divided in two parts, 2096 and 6289, that added together give a triangular number (8385 = T₁₂₉).

The spelling of 20966289 in words is "twenty million, nine hundred sixty-six thousand, two hundred eighty-nine".