20534656 has 32 divisors (see below), whose sum is σ = 41242680. Its totient is φ = 10183680.

The previous prime is 20534603. The next prime is 20534669. The reversal of 20534656 is 65643502.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16951 + ... + 18121.

Almost surely, 2^20534656 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 20534656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20621340).

20534656 is an abundant number, since it is smaller than the sum of its proper divisors (20708024).

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

20534656 is a wasteful number, since it uses less digits than its factorization.

20534656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1322 (or 1310 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 31.

The square root of 20534656 is about 4531.5180679326. The cubic root of 20534656 is about 273.8393218525.

The spelling of 20534656 in words is "twenty million, five hundred thirty-four thousand, six hundred fifty-six".