20675123 has 4 divisors (see below), whose sum is σ = 23628720. Its totient is φ = 17721528.

The previous prime is 20675117. The next prime is 20675143. The reversal of 20675123 is 32157602.

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 20675123 - 2⁴ = 20675107 is a prime.

It is a super-2 number, since 2×20675123² = 854921422130258, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20675092 and 20675101.

It is not an unprimeable number, because it can be changed into a prime (20675113) 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, 1476788 + ... + 1476801.

It is an arithmetic number, because the mean of its divisors is an integer number (5907180).

Almost surely, 2^20675123 is an apocalyptic number.

20675123 is a deficient number, since it is larger than the sum of its proper divisors (2953597).

20675123 is an equidigital number, since it uses as much as digits as its factorization.

20675123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2953596.

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 20675123 is about 4546.9905432055. The cubic root of 20675123 is about 274.4623014067.

The spelling of 20675123 in words is "twenty million, six hundred seventy-five thousand, one hundred twenty-three".