20342789 has 8 divisors (see below), whose sum is σ = 21154560. Its totient is φ = 19540800.

The previous prime is 20342783. The next prime is 20342801. The reversal of 20342789 is 98724302.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20342789 - 2⁸ = 20342533 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 (20342783) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1949 + ... + 6669.

It is an arithmetic number, because the mean of its divisors is an integer number (2644320).

Almost surely, 2^20342789 is an apocalyptic number.

It is an amenable number.

20342789 is a deficient number, since it is larger than the sum of its proper divisors (811771).

20342789 is a wasteful number, since it uses less digits than its factorization.

20342789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4891.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 20342789 is about 4510.2981054471. The cubic root of 20342789 is about 272.9837726896.

The spelling of 20342789 in words is "twenty million, three hundred forty-two thousand, seven hundred eighty-nine".