20212789 has 4 divisors (see below), whose sum is σ = 21276640. Its totient is φ = 19148940.

The previous prime is 20212771. The next prime is 20212799. The reversal of 20212789 is 98721202.

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 20212789 - 2²¹ = 18115637 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20212789.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20212729) 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, 531897 + ... + 531934.

It is an arithmetic number, because the mean of its divisors is an integer number (5319160).

Almost surely, 2^20212789 is an apocalyptic number.

It is an amenable number.

20212789 is a deficient number, since it is larger than the sum of its proper divisors (1063851).

20212789 is a wasteful number, since it uses less digits than its factorization.

20212789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1063850.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 20212789 is about 4495.8635433029. The cubic root of 20212789 is about 272.4010313104.

The spelling of 20212789 in words is "twenty million, two hundred twelve thousand, seven hundred eighty-nine".