20022623 has 4 divisors (see below), whose sum is σ = 20037528. Its totient is φ = 20007720.

The previous prime is 20022619. The next prime is 20022631. The reversal of 20022623 is 32622002.

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

It is a cyclic number.

It is not a de Polignac number, because 20022623 - 2² = 20022619 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20022323) 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, 5213 + ... + 8198.

It is an arithmetic number, because the mean of its divisors is an integer number (5009382).

Almost surely, 2^20022623 is an apocalyptic number.

20022623 is a deficient number, since it is larger than the sum of its proper divisors (14905).

20022623 is a wasteful number, since it uses less digits than its factorization.

20022623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14904.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 20022623 is about 4474.6645684342. The cubic root of 20022623 is about 271.5440702100.

Adding to 20022623 its reverse (32622002), we get a palindrome (52644625).

The spelling of 20022623 in words is "twenty million, twenty-two thousand, six hundred twenty-three".