20725728241 has 4 divisors (see below), whose sum is σ = 20852880112. Its totient is φ = 20598576372.

The previous prime is 20725728217. The next prime is 20725728253. The reversal of 20725728241 is 14282752702.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20725728241 - 2⁷ = 20725728113 is a prime.

It is a super-2 number, since 2×20725728241² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20725728194 and 20725728203.

It is not an unprimeable number, because it can be changed into a prime (20725728341) 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, 63575691 + ... + 63576016.

It is an arithmetic number, because the mean of its divisors is an integer number (5213220028).

Almost surely, 2^20725728241 is an apocalyptic number.

It is an amenable number.

20725728241 is a deficient number, since it is larger than the sum of its proper divisors (127151871).

20725728241 is a wasteful number, since it uses less digits than its factorization.

20725728241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127151870.

The product of its (nonzero) digits is 125440, while the sum is 40.

The spelling of 20725728241 in words is "twenty billion, seven hundred twenty-five million, seven hundred twenty-eight thousand, two hundred forty-one".