20839320 has 96 divisors (see below), whose sum is σ = 68487120. Its totient is φ = 5495040.

The previous prime is 20839319. The next prime is 20839327. The reversal of 20839320 is 2393802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20839327) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 38250 + ... + 38790.

Almost surely, 2^20839320 is an apocalyptic number.

20839320 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 20839320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34243560).

20839320 is an abundant number, since it is smaller than the sum of its proper divisors (47647800).

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

20839320 is a wasteful number, since it uses less digits than its factorization.

20839320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 665 (or 658 counting only the distinct ones).

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

The square root of 20839320 is about 4565.0104052455. The cubic root of 20839320 is about 275.1869582674.

The spelling of 20839320 in words is "twenty million, eight hundred thirty-nine thousand, three hundred twenty".