20428759 has 8 divisors (see below), whose sum is σ = 22311072. Its totient is φ = 18590880.

The previous prime is 20428757. The next prime is 20428777. The reversal of 20428759 is 95782402.

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 20428759 - 2¹ = 20428757 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 (20428757) 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, 10144 + ... + 11989.

It is an arithmetic number, because the mean of its divisors is an integer number (2788884).

Almost surely, 2^20428759 is an apocalyptic number.

20428759 is a deficient number, since it is larger than the sum of its proper divisors (1882313).

20428759 is a wasteful number, since it uses less digits than its factorization.

20428759 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22217.

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 20428759 is about 4519.8184698061. The cubic root of 20428759 is about 273.3677815331.

It can be divided in two parts, 2042 and 8759, that added together give a palindrome (10801).

The spelling of 20428759 in words is "twenty million, four hundred twenty-eight thousand, seven hundred fifty-nine".