20725543 has 8 divisors (see below), whose sum is σ = 21516480. Its totient is φ = 19949280.

The previous prime is 20725501. The next prime is 20725547. The reversal of 20725543 is 34552702.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20725543 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20725547) 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, 748 + ... + 6481.

It is an arithmetic number, because the mean of its divisors is an integer number (2689560).

Almost surely, 2^20725543 is an apocalyptic number.

20725543 is a deficient number, since it is larger than the sum of its proper divisors (790937).

20725543 is an equidigital number, since it uses as much as digits as its factorization.

20725543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7337.

The product of its (nonzero) digits is 8400, while the sum is 28.

The square root of 20725543 is about 4552.5314935759. The cubic root of 20725543 is about 274.6852288240.

The spelling of 20725543 in words is "twenty million, seven hundred twenty-five thousand, five hundred forty-three".