20725617 has 8 divisors (see below), whose sum is σ = 30146400. Its totient is φ = 12560960.

The previous prime is 20725603. The next prime is 20725619. The reversal of 20725617 is 71652702.

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 20725617 - 2⁷ = 20725489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20725619) 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, 313992 + ... + 314057.

It is an arithmetic number, because the mean of its divisors is an integer number (3768300).

Almost surely, 2^20725617 is an apocalyptic number.

It is an amenable number.

20725617 is a deficient number, since it is larger than the sum of its proper divisors (9420783).

20725617 is a wasteful number, since it uses less digits than its factorization.

20725617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 628063.

The product of its (nonzero) digits is 5880, while the sum is 30.

The square root of 20725617 is about 4552.5396209149. The cubic root of 20725617 is about 274.6855557424.

The spelling of 20725617 in words is "twenty million, seven hundred twenty-five thousand, six hundred seventeen".