20539456 has 84 divisors (see below), whose sum is σ = 49548288. Its totient is φ = 8273664.

The previous prime is 20539433. The next prime is 20539481. The reversal of 20539456 is 65493502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 161665 + ... + 161791.

Almost surely, 2^20539456 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 20539456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24774144).

20539456 is an abundant number, since it is smaller than the sum of its proper divisors (29008832).

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

20539456 is a wasteful number, since it uses less digits than its factorization.

20539456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184 (or 155 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 34.

The square root of 20539456 is about 4532.0476608262. The cubic root of 20539456 is about 273.8606569448.

The spelling of 20539456 in words is "twenty million, five hundred thirty-nine thousand, four hundred fifty-six".