20725529 has 8 divisors (see below), whose sum is σ = 22643040. Its totient is φ = 18813600.

The previous prime is 20725501. The next prime is 20725547. The reversal of 20725529 is 92552702.

It is a happy number.

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 20725529 - 2⁸ = 20725273 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20725495 and 20725504.

It is not an unprimeable number, because it can be changed into a prime (20725589) 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, 12077 + ... + 13685.

It is an arithmetic number, because the mean of its divisors is an integer number (2830380).

Almost surely, 2^20725529 is an apocalyptic number.

It is an amenable number.

20725529 is a deficient number, since it is larger than the sum of its proper divisors (1917511).

20725529 is a wasteful number, since it uses less digits than its factorization.

20725529 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2791.

The product of its (nonzero) digits is 12600, while the sum is 32.

The square root of 20725529 is about 4552.5299559695. The cubic root of 20725529 is about 274.6851669745.

The spelling of 20725529 in words is "twenty million, seven hundred twenty-five thousand, five hundred twenty-nine".