20570023 has 4 divisors (see below), whose sum is σ = 20650320. Its totient is φ = 20489728.

The previous prime is 20570021. The next prime is 20570029. The reversal of 20570023 is 32007502.

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: 32007502 = 2 ⋅16003751.

It is a cyclic number.

It is not a de Polignac number, because 20570023 - 2¹ = 20570021 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 (20570021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39763 + ... + 40276.

It is an arithmetic number, because the mean of its divisors is an integer number (5162580).

Almost surely, 2^20570023 is an apocalyptic number.

20570023 is a deficient number, since it is larger than the sum of its proper divisors (80297).

20570023 is an equidigital number, since it uses as much as digits as its factorization.

20570023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80296.

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

The square root of 20570023 is about 4535.4187237784. The cubic root of 20570023 is about 273.9964435577.

Adding to 20570023 its reverse (32007502), we get a palindrome (52577525).

The spelling of 20570023 in words is "twenty million, five hundred seventy thousand, twenty-three".