20145023 has 4 divisors (see below), whose sum is σ = 20247480. Its totient is φ = 20042568.

The previous prime is 20144989. The next prime is 20145029. The reversal of 20145023 is 32054102.

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 20145023 - 2⁸ = 20144767 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20144992 and 20145010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20145029) 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, 50933 + ... + 51326.

It is an arithmetic number, because the mean of its divisors is an integer number (5061870).

Almost surely, 2^20145023 is an apocalyptic number.

20145023 is a deficient number, since it is larger than the sum of its proper divisors (102457).

20145023 is a wasteful number, since it uses less digits than its factorization.

20145023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102456.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 20145023 is about 4488.3207327463. The cubic root of 20145023 is about 272.0962705288.

Adding to 20145023 its reverse (32054102), we get a palindrome (52199125).

The spelling of 20145023 in words is "twenty million, one hundred forty-five thousand, twenty-three".