20726189 has 4 divisors (see below), whose sum is σ = 22610400. Its totient is φ = 18841980.

The previous prime is 20726183. The next prime is 20726191. The reversal of 20726189 is 98162702.

It is a happy number.

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 20726189 - 2²⁰ = 19677613 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20726183) 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, 942089 + ... + 942110.

It is an arithmetic number, because the mean of its divisors is an integer number (5652600).

Almost surely, 2^20726189 is an apocalyptic number.

It is an amenable number.

20726189 is a deficient number, since it is larger than the sum of its proper divisors (1884211).

20726189 is a wasteful number, since it uses less digits than its factorization.

20726189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1884210.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 20726189 is about 4552.6024425596. The cubic root of 20726189 is about 274.6880827069.

The spelling of 20726189 in words is "twenty million, seven hundred twenty-six thousand, one hundred eighty-nine".