20006623 has 16 divisors (see below), whose sum is σ = 24861760. Its totient is φ = 15676416.

The previous prime is 20006621. The next prime is 20006641. The reversal of 20006623 is 32660002.

It is not a de Polignac number, because 20006623 - 2¹ = 20006621 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20006623.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20006621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8911 + ... + 10927.

It is an arithmetic number, because the mean of its divisors is an integer number (1553860).

Almost surely, 2^20006623 is an apocalyptic number.

20006623 is a deficient number, since it is larger than the sum of its proper divisors (4855137).

20006623 is a wasteful number, since it uses less digits than its factorization.

20006623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2146.

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 20006623 is about 4472.8763676185. The cubic root of 20006623 is about 271.4717209992.

Adding to 20006623 its reverse (32660002), we get a palindrome (52666625).

The spelling of 20006623 in words is "twenty million, six thousand, six hundred twenty-three".