20870023 has 2 divisors, whose sum is σ = 20870024. Its totient is φ = 20870022.

The previous prime is 20869987. The next prime is 20870051. The reversal of 20870023 is 32007802.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20870023 - 2¹⁷ = 20738951 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20869976 and 20870003.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20870063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10435011 + 10435012.

It is an arithmetic number, because the mean of its divisors is an integer number (10435012).

Almost surely, 2^20870023 is an apocalyptic number.

20870023 is a deficient number, since it is larger than the sum of its proper divisors (1).

20870023 is an equidigital number, since it uses as much as digits as its factorization.

20870023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 20870023 is about 4568.3720295090. The cubic root of 20870023 is about 275.3220381577.

Adding to 20870023 its reverse (32007802), we get a palindrome (52877825).

The spelling of 20870023 in words is "twenty million, eight hundred seventy thousand, twenty-three".