20208672 has 72 divisors (see below), whose sum is σ = 62702640. Its totient is φ = 6122880.

The previous prime is 20208641. The next prime is 20208691. The reversal of 20208672 is 27680202.

It is a tau number, because it is divible by the number of its divisors (72).

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, 22 + ... + 6357.

It is an arithmetic number, because the mean of its divisors is an integer number (870870).

Almost surely, 2^20208672 is an apocalyptic number.

20208672 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20208672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31351320).

20208672 is an abundant number, since it is smaller than the sum of its proper divisors (42493968).

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

20208672 is a wasteful number, since it uses less digits than its factorization.

20208672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6406 (or 6395 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 20208672 is about 4495.4056546657. The cubic root of 20208672 is about 272.3825355749.

Adding to 20208672 its reverse (27680202), we get a palindrome (47888874).

The spelling of 20208672 in words is "twenty million, two hundred eight thousand, six hundred seventy-two".