20008623 has 4 divisors (see below), whose sum is σ = 26678168. Its totient is φ = 13339080.

The previous prime is 20008621. The next prime is 20008649. The reversal of 20008623 is 32680002.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20008623 - 2¹ = 20008621 is a prime.

It is a super-2 number, since 2×20008623² = 800689988712258, which contains 22 as substring.

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 20008623.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20008621) 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, 3334768 + ... + 3334773.

It is an arithmetic number, because the mean of its divisors is an integer number (6669542).

Almost surely, 2^20008623 is an apocalyptic number.

20008623 is a deficient number, since it is larger than the sum of its proper divisors (6669545).

20008623 is an equidigital number, since it uses as much as digits as its factorization.

20008623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6669544.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 20008623 is about 4473.0999318146. The cubic root of 20008623 is about 271.4807667595.

Adding to 20008623 its reverse (32680002), we get a palindrome (52688625).

The spelling of 20008623 in words is "twenty million, eight thousand, six hundred twenty-three".