20339856 has 80 divisors (see below), whose sum is σ = 58924800. Its totient is φ = 6717312.

The previous prime is 20339849. The next prime is 20339857. The reversal of 20339856 is 65893302.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 20339856.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20339857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84985 + ... + 85223.

It is an arithmetic number, because the mean of its divisors is an integer number (736560).

Almost surely, 2^20339856 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20339856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29462400).

20339856 is an abundant number, since it is smaller than the sum of its proper divisors (38584944).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20339856 is a wasteful number, since it uses less digits than its factorization.

20339856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 453 (or 441 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 20339856 is about 4509.9729489211. The cubic root of 20339856 is about 272.9706525632.

The spelling of 20339856 in words is "twenty million, three hundred thirty-nine thousand, eight hundred fifty-six".