20906373 has 4 divisors (see below), whose sum is σ = 27875168. Its totient is φ = 13937580.

The previous prime is 20906371. The next prime is 20906377. The reversal of 20906373 is 37360902.

It is a happy number.

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 not a de Polignac number, because 20906373 - 2¹ = 20906371 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20906373.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20906371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3484393 + ... + 3484398.

It is an arithmetic number, because the mean of its divisors is an integer number (6968792).

Almost surely, 2^20906373 is an apocalyptic number.

It is an amenable number.

20906373 is a deficient number, since it is larger than the sum of its proper divisors (6968795).

20906373 is an equidigital number, since it uses as much as digits as its factorization.

20906373 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6968794.

The product of its (nonzero) digits is 6804, while the sum is 30.

The square root of 20906373 is about 4572.3487399804. The cubic root of 20906373 is about 275.4817912368.

The spelling of 20906373 in words is "twenty million, nine hundred six thousand, three hundred seventy-three".