20521214 has 8 divisors (see below), whose sum is σ = 35179248. Its totient is φ = 8794800.

The previous prime is 20521181. The next prime is 20521217. The reversal of 20521214 is 41212502.

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

It is a super-2 number, since 2×20521214² = 842240448067592, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20521192 and 20521201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20521217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 732887 + ... + 732914.

It is an arithmetic number, because the mean of its divisors is an integer number (4397406).

Almost surely, 2^20521214 is an apocalyptic number.

20521214 is a deficient number, since it is larger than the sum of its proper divisors (14658034).

20521214 is a wasteful number, since it uses less digits than its factorization.

20521214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1465810.

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 20521214 is about 4530.0346577041. The cubic root of 20521214 is about 273.7795570068.

Adding to 20521214 its reverse (41212502), we get a palindrome (61733716).

The spelling of 20521214 in words is "twenty million, five hundred twenty-one thousand, two hundred fourteen".