20528990 has 8 divisors (see below), whose sum is σ = 36952200. Its totient is φ = 8211592.

The previous prime is 20528947. The next prime is 20528993. The reversal of 20528990 is 9982502.

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

It is a self number, because there is not a number n which added to its sum of digits gives 20528990.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20528993) 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, 1026440 + ... + 1026459.

It is an arithmetic number, because the mean of its divisors is an integer number (4619025).

Almost surely, 2^20528990 is an apocalyptic number.

20528990 is a deficient number, since it is larger than the sum of its proper divisors (16423210).

20528990 is a wasteful number, since it uses less digits than its factorization.

20528990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2052906.

The product of its (nonzero) digits is 12960, while the sum is 35.

The square root of 20528990 is about 4530.8928479936. The cubic root of 20528990 is about 273.8141332749.

It can be divided in two parts, 205289 and 90, that added together give a cube (205379 = 59³).

The spelling of 20528990 in words is "twenty million, five hundred twenty-eight thousand, nine hundred ninety".