20282521 has 12 divisors (see below), whose sum is σ = 24098688. Its totient is φ = 17013192.

The previous prime is 20282473. The next prime is 20282543. The reversal of 20282521 is 12528202.

It is not a de Polignac number, because 20282521 - 2¹³ = 20274329 is a prime.

It is a super-2 number, since 2×20282521² = 822761316230882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20282492 and 20282501.

It is not an unprimeable number, because it can be changed into a prime (20282551) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2101 + ... + 6706.

It is an arithmetic number, because the mean of its divisors is an integer number (2008224).

Almost surely, 2^20282521 is an apocalyptic number.

It is an amenable number.

20282521 is a deficient number, since it is larger than the sum of its proper divisors (3816167).

20282521 is an equidigital number, since it uses as much as digits as its factorization.

20282521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8868 (or 8861 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 20282521 is about 4503.6119948326. The cubic root of 20282521 is about 272.7139234240.

The spelling of 20282521 in words is "twenty million, two hundred eighty-two thousand, five hundred twenty-one".