20038720 has 56 divisors (see below), whose sum is σ = 51398424. Its totient is φ = 7397376.

The previous prime is 20038687. The next prime is 20038723. The reversal of 20038720 is 2783002.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 254016 + 19784704 = 504^2 + 4448^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20038691 and 20038700.

It is not an unprimeable number, because it can be changed into a prime (20038723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1752 + ... + 6568.

It is an arithmetic number, because the mean of its divisors is an integer number (917829).

Almost surely, 2^20038720 is an apocalyptic number.

20038720 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 20038720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25699212).

20038720 is an abundant number, since it is smaller than the sum of its proper divisors (31359704).

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

20038720 is a wasteful number, since it uses less digits than its factorization.

20038720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4847 (or 4837 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 20038720 is about 4476.4628893804. The cubic root of 20038720 is about 271.6168191545.

The spelling of 20038720 in words is "twenty million, thirty-eight thousand, seven hundred twenty".