20636672 has 44 divisors (see below), whose sum is σ = 47162880. Its totient is φ = 8841216.

The previous prime is 20636621. The next prime is 20636683. The reversal of 20636672 is 27663602.

It is a Harshad number since it is a multiple of its sum of digits (32).

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, 5729 + ... + 8607.

Almost surely, 2^20636672 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 20636672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23581440).

20636672 is an abundant number, since it is smaller than the sum of its proper divisors (26526208).

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

20636672 is an equidigital number, since it uses as much as digits as its factorization.

20636672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2906 (or 2888 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 32.

The square root of 20636672 is about 4542.7603942977. The cubic root of 20636672 is about 274.2920501182.

The spelling of 20636672 in words is "twenty million, six hundred thirty-six thousand, six hundred seventy-two".