20939136 has 64 divisors (see below), whose sum is σ = 57446400. Its totient is φ = 6750720.

The previous prime is 20939123. The next prime is 20939147. The reversal of 20939136 is 63193902.

It is a tau number, because it is divible by the number of its divisors (64).

It is a junction number, because it is equal to n+sod(n) for n = 20939097 and 20939106.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11025 + ... + 12783.

It is an arithmetic number, because the mean of its divisors is an integer number (897600).

Almost surely, 2^20939136 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 20939136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28723200).

20939136 is an abundant number, since it is smaller than the sum of its proper divisors (36507264).

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

20939136 is a wasteful number, since it uses less digits than its factorization.

20939136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1807 (or 1795 counting only the distinct ones).

The product of its (nonzero) digits is 8748, while the sum is 33.

The square root of 20939136 is about 4575.9300693957. The cubic root of 20939136 is about 275.6256213704.

The spelling of 20939136 in words is "twenty million, nine hundred thirty-nine thousand, one hundred thirty-six".