20605023 has 10 divisors (see below), whose sum is σ = 30780464. Its totient is φ = 13736628.

The previous prime is 20605021. The next prime is 20605043. The reversal of 20605023 is 32050602.

It is not a de Polignac number, because 20605023 - 2¹ = 20605021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20604987 and 20605005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20605021) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 127111 + ... + 127272.

Almost surely, 2^20605023 is an apocalyptic number.

20605023 is a deficient number, since it is larger than the sum of its proper divisors (10175441).

20605023 is an equidigital number, since it uses as much as digits as its factorization.

20605023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254395 (or 254386 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 20605023 is about 4539.2756030010. The cubic root of 20605023 is about 274.1517576213.

Adding to 20605023 its reverse (32050602), we get a palindrome (52655625).

The spelling of 20605023 in words is "twenty million, six hundred five thousand, twenty-three".