20527989 has 8 divisors (see below), whose sum is σ = 27402432. Its totient is φ = 13669440.

The previous prime is 20527981. The next prime is 20528023. The reversal of 20527989 is 98972502.

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

It is not a de Polignac number, because 20527989 - 2³ = 20527981 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20527989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20527981) 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, 532 + ... + 6429.

It is an arithmetic number, because the mean of its divisors is an integer number (3425304).

Almost surely, 2^20527989 is an apocalyptic number.

It is an amenable number.

20527989 is a deficient number, since it is larger than the sum of its proper divisors (6874443).

20527989 is an equidigital number, since it uses as much as digits as its factorization.

20527989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7947.

The product of its (nonzero) digits is 90720, while the sum is 42.

The square root of 20527989 is about 4530.7823827679. The cubic root of 20527989 is about 273.8096827816.

The spelling of 20527989 in words is "twenty million, five hundred twenty-seven thousand, nine hundred eighty-nine".