20025721 has 8 divisors (see below), whose sum is σ = 21024000. Its totient is φ = 19049520.

The previous prime is 20025703. The next prime is 20025727. The reversal of 20025721 is 12752002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20025721 - 2⁹ = 20025209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20025727) 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, 3646 + ... + 7303.

It is an arithmetic number, because the mean of its divisors is an integer number (2628000).

Almost surely, 2^20025721 is an apocalyptic number.

It is an amenable number.

20025721 is a deficient number, since it is larger than the sum of its proper divisors (998279).

20025721 is a wasteful number, since it uses less digits than its factorization.

20025721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11039.

The product of its (nonzero) digits is 280, while the sum is 19.

The square root of 20025721 is about 4475.0107262441. The cubic root of 20025721 is about 271.5580743716.

Adding to 20025721 its reverse (12752002), we get a palindrome (32777723).

It can be divided in two parts, 200 and 25721, that added together give a square (25921 = 161²).

The spelling of 20025721 in words is "twenty million, twenty-five thousand, seven hundred twenty-one".