20791272 has 64 divisors (see below), whose sum is σ = 55598400. Its totient is φ = 6456320.

The previous prime is 20791261. The next prime is 20791273. The reversal of 20791272 is 27219702.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20791273) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53254 + ... + 53642.

It is an arithmetic number, because the mean of its divisors is an integer number (868725).

Almost surely, 2^20791272 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 20791272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27799200).

20791272 is an abundant number, since it is smaller than the sum of its proper divisors (34807128).

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

20791272 is a wasteful number, since it uses less digits than its factorization.

20791272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 546 (or 542 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 30.

The square root of 20791272 is about 4559.7447296970. The cubic root of 20791272 is about 274.9753013631.

The spelling of 20791272 in words is "twenty million, seven hundred ninety-one thousand, two hundred seventy-two".