20521282 has 8 divisors (see below), whose sum is σ = 31362876. Its totient is φ = 10066992.

The previous prime is 20521271. The next prime is 20521283. The reversal of 20521282 is 28212502.

It can be written as a sum of positive squares in 2 ways, for example, as 19989841 + 531441 = 4471^2 + 729^2 .

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

It is a super-3 number, since 3×20521282³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (20521283) 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, 96693 + ... + 96904.

Almost surely, 2^20521282 is an apocalyptic number.

20521282 is a deficient number, since it is larger than the sum of its proper divisors (10841594).

20521282 is a wasteful number, since it uses less digits than its factorization.

20521282 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193652.

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

The square root of 20521282 is about 4530.0421631592. The cubic root of 20521282 is about 273.7798594091.

Adding to 20521282 its reverse (28212502), we get a palindrome (48733784).

The spelling of 20521282 in words is "twenty million, five hundred twenty-one thousand, two hundred eighty-two".