20670623 has 4 divisors (see below), whose sum is σ = 21886560. Its totient is φ = 19454688.

The previous prime is 20670577. The next prime is 20670631. The reversal of 20670623 is 32607602.

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 20670623 - 2¹⁴ = 20654239 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20670592 and 20670601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20670653) 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, 607943 + ... + 607976.

It is an arithmetic number, because the mean of its divisors is an integer number (5471640).

Almost surely, 2^20670623 is an apocalyptic number.

20670623 is a deficient number, since it is larger than the sum of its proper divisors (1215937).

20670623 is a wasteful number, since it uses less digits than its factorization.

20670623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1215936.

The product of its (nonzero) digits is 3024, while the sum is 26.

The square root of 20670623 is about 4546.4956834907. The cubic root of 20670623 is about 274.4423874587.

The spelling of 20670623 in words is "twenty million, six hundred seventy thousand, six hundred twenty-three".