20064720 has 160 divisors (see below), whose sum is σ = 68745600. Its totient is φ = 4810752.

The previous prime is 20064701. The next prime is 20064721. The reversal of 20064720 is 2746002.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20064721) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 184026 + ... + 184134.

It is an arithmetic number, because the mean of its divisors is an integer number (429660).

Almost surely, 2^20064720 is an apocalyptic number.

20064720 is a gapful number since it is divisible by the number (20) 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 20064720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34372800).

20064720 is an abundant number, since it is smaller than the sum of its proper divisors (48680880).

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

20064720 is a wasteful number, since it uses less digits than its factorization.

20064720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197 (or 191 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 20064720 is about 4479.3660265712. The cubic root of 20064720 is about 271.7342415779.

The spelling of 20064720 in words is "twenty million, sixty-four thousand, seven hundred twenty".