20339820 has 144 divisors (see below), whose sum is σ = 68402880. Its totient is φ = 4882944.

The previous prime is 20339819. The next prime is 20339831. The reversal of 20339820 is 2893302.

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 47 ways as a sum of consecutive naturals, for example, 884329 + ... + 884351.

It is an arithmetic number, because the mean of its divisors is an integer number (475020).

Almost surely, 2^20339820 is an apocalyptic number.

20339820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20339820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34201440).

20339820 is an abundant number, since it is smaller than the sum of its proper divisors (48063060).

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

20339820 is a wasteful number, since it uses less digits than its factorization.

20339820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89 (or 50 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 20339820 is about 4509.9689577646. The cubic root of 20339820 is about 272.9704915173.

The spelling of 20339820 in words is "twenty million, three hundred thirty-nine thousand, eight hundred twenty".