20339928 has 48 divisors (see below), whose sum is σ = 62958480. Its totient is φ = 5811264.

The previous prime is 20339909. The next prime is 20339941. The reversal of 20339928 is 82993302.

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

It is a junction number, because it is equal to n+sod(n) for n = 20339892 and 20339901.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19675 + ... + 20682.

It is an arithmetic number, because the mean of its divisors is an integer number (1311635).

Almost surely, 2^20339928 is an apocalyptic number.

20339928 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20339928 is an abundant number, since it is smaller than the sum of its proper divisors (42618552).

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

20339928 is a wasteful number, since it uses less digits than its factorization.

20339928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40376 (or 40369 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 20339928 is about 4509.9809312235. The cubic root of 20339928 is about 272.9709746543.

The spelling of 20339928 in words is "twenty million, three hundred thirty-nine thousand, nine hundred twenty-eight".