20645211 has 8 divisors (see below), whose sum is σ = 27549504. Its totient is φ = 13752200.

The previous prime is 20645201. The next prime is 20645239. The reversal of 20645211 is 11254602.

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

It is a cyclic number.

It is not a de Polignac number, because 20645211 - 2⁶ = 20645147 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20645201) 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 7 ways as a sum of consecutive naturals, for example, 3436 + ... + 7286.

It is an arithmetic number, because the mean of its divisors is an integer number (3443688).

Almost surely, 2^20645211 is an apocalyptic number.

20645211 is a deficient number, since it is larger than the sum of its proper divisors (6904293).

20645211 is a wasteful number, since it uses less digits than its factorization.

20645211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5641.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 20645211 is about 4543.7001441556. The cubic root of 20645211 is about 274.3298769028.

Adding to 20645211 its reverse (11254602), we get a palindrome (31899813).

The spelling of 20645211 in words is "twenty million, six hundred forty-five thousand, two hundred eleven".