20623211 has 8 divisors (see below), whose sum is σ = 23606784. Its totient is φ = 17649000.

The previous prime is 20623181. The next prime is 20623217. The reversal of 20623211 is 11232602.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20623211 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20623211.

It is not an unprimeable number, because it can be changed into a prime (20623217) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3296 + ... + 7218.

It is an arithmetic number, because the mean of its divisors is an integer number (2950848).

Almost surely, 2^20623211 is an apocalyptic number.

20623211 is a deficient number, since it is larger than the sum of its proper divisors (2983573).

20623211 is an equidigital number, since it uses as much as digits as its factorization.

20623211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4681.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 20623211 is about 4541.2785644574. The cubic root of 20623211 is about 274.2323982458.

Adding to 20623211 its reverse (11232602), we get a palindrome (31855813).

The spelling of 20623211 in words is "twenty million, six hundred twenty-three thousand, two hundred eleven".