20507023 has 4 divisors (see below), whose sum is σ = 21586360. Its totient is φ = 19427688.

The previous prime is 20507021. The next prime is 20507033. The reversal of 20507023 is 32070502.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32070502 = 2 ⋅16035251.

It is a cyclic number.

It is not a de Polignac number, because 20507023 - 2¹ = 20507021 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 1079317 = 20507023 / (2 + 0 + 5 + 0 + 7 + 0 + 2 + 3).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20507021) 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, 539640 + ... + 539677.

It is an arithmetic number, because the mean of its divisors is an integer number (5396590).

Almost surely, 2^20507023 is an apocalyptic number.

20507023 is a deficient number, since it is larger than the sum of its proper divisors (1079337).

20507023 is a wasteful number, since it uses less digits than its factorization.

20507023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1079336.

The product of its (nonzero) digits is 420, while the sum is 19.

The square root of 20507023 is about 4528.4680632638. The cubic root of 20507023 is about 273.7164336845.

Adding to 20507023 its reverse (32070502), we get a palindrome (52577525).

The spelling of 20507023 in words is "twenty million, five hundred seven thousand, twenty-three".