20725271 has 4 divisors (see below), whose sum is σ = 23686032. Its totient is φ = 17764512.

The previous prime is 20725249. The next prime is 20725273. The reversal of 20725271 is 17252702.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20725271 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20725271.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20725273) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1480370 + ... + 1480383.

It is an arithmetic number, because the mean of its divisors is an integer number (5921508).

Almost surely, 2^20725271 is an apocalyptic number.

20725271 is a deficient number, since it is larger than the sum of its proper divisors (2960761).

20725271 is an equidigital number, since it uses as much as digits as its factorization.

20725271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2960760.

The product of its (nonzero) digits is 1960, while the sum is 26.

The square root of 20725271 is about 4552.5016199887. The cubic root of 20725271 is about 274.6840271714.

Adding to 20725271 its reverse (17252702), we get a palindrome (37977973).

The spelling of 20725271 in words is "twenty million, seven hundred twenty-five thousand, two hundred seventy-one".