20521085 has 16 divisors (see below), whose sum is σ = 26974080. Its totient is φ = 14894400.

The previous prime is 20521073. The next prime is 20521099. The reversal of 20521085 is 58012502.

It is not a de Polignac number, because 20521085 - 2⁴ = 20521069 is a prime.

It is a super-2 number, since 2×20521085² = 842229859154450, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20521085.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1160 + ... + 6510.

It is an arithmetic number, because the mean of its divisors is an integer number (1685880).

Almost surely, 2^20521085 is an apocalyptic number.

It is an amenable number.

20521085 is a deficient number, since it is larger than the sum of its proper divisors (6452995).

20521085 is a wasteful number, since it uses less digits than its factorization.

20521085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5428.

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 20521085 is about 4530.0204193800. The cubic root of 20521085 is about 273.7789833299.

Adding to 20521085 its reverse (58012502), we get a palindrome (78533587).

The spelling of 20521085 in words is "twenty million, five hundred twenty-one thousand, eighty-five".