20244689 has 4 divisors (see below), whose sum is σ = 20404224. Its totient is φ = 20085156.

The previous prime is 20244683. The next prime is 20244691. The reversal of 20244689 is 98644202.

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 20244689 - 2⁴ = 20244673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20244683) 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, 79577 + ... + 79830.

It is an arithmetic number, because the mean of its divisors is an integer number (5101056).

Almost surely, 2^20244689 is an apocalyptic number.

It is an amenable number.

20244689 is a deficient number, since it is larger than the sum of its proper divisors (159535).

20244689 is a wasteful number, since it uses less digits than its factorization.

20244689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159534.

The product of its (nonzero) digits is 27648, while the sum is 35.

The square root of 20244689 is about 4499.4098501915. The cubic root of 20244689 is about 272.5442578846.

The spelling of 20244689 in words is "twenty million, two hundred forty-four thousand, six hundred eighty-nine".