20906673 has 4 divisors (see below), whose sum is σ = 27875568. Its totient is φ = 13937780.

The previous prime is 20906647. The next prime is 20906687. The reversal of 20906673 is 37660902.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20906673 - 2¹² = 20902577 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20906173) 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, 3484443 + ... + 3484448.

It is an arithmetic number, because the mean of its divisors is an integer number (6968892).

Almost surely, 2^20906673 is an apocalyptic number.

It is an amenable number.

20906673 is a deficient number, since it is larger than the sum of its proper divisors (6968895).

20906673 is an equidigital number, since it uses as much as digits as its factorization.

20906673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6968894.

The product of its (nonzero) digits is 13608, while the sum is 33.

The square root of 20906673 is about 4572.3815457593. The cubic root of 20906673 is about 275.4831089234.

The spelling of 20906673 in words is "twenty million, nine hundred six thousand, six hundred seventy-three".