20641536 has 162 divisors, whose sum is σ = 65260832. Its totient is φ = 6266880.

The previous prime is 20641529. The next prime is 20641541. The reversal of 20641536 is 63514602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 665841 + ... + 665871.

Almost surely, 2^20641536 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 20641536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32630416).

20641536 is an abundant number, since it is smaller than the sum of its proper divisors (44619296).

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

20641536 is a wasteful number, since it uses less digits than its factorization.

20641536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87 (or 53 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 20641536 is about 4543.2957200693. The cubic root of 20641536 is about 274.3135983557.

It can be divided in two parts, 2064 and 1536, that added together give a square (3600 = 60²).

The spelling of 20641536 in words is "twenty million, six hundred forty-one thousand, five hundred thirty-six".