20623143 has 4 divisors (see below), whose sum is σ = 27497528. Its totient is φ = 13748760.

The previous prime is 20623139. The next prime is 20623181. The reversal of 20623143 is 34132602.

It is a happy number.

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

It is not a de Polignac number, because 20623143 - 2² = 20623139 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 (20623103) 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, 3437188 + ... + 3437193.

It is an arithmetic number, because the mean of its divisors is an integer number (6874382).

Almost surely, 2^20623143 is an apocalyptic number.

20623143 is a deficient number, since it is larger than the sum of its proper divisors (6874385).

20623143 is an equidigital number, since it uses as much as digits as its factorization.

20623143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6874384.

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 20623143 is about 4541.2710775729. The cubic root of 20623143 is about 274.2320968406.

Adding to 20623143 its reverse (34132602), we get a palindrome (54755745).

The spelling of 20623143 in words is "twenty million, six hundred twenty-three thousand, one hundred forty-three".