20916373 has 4 divisors (see below), whose sum is σ = 20929888. Its totient is φ = 20902860.

The previous prime is 20916349. The next prime is 20916403. The reversal of 20916373 is 37361902.

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 a de Polignac number, because none of the positive numbers 2^k-20916373 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20916073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4083 + ... + 7648.

It is an arithmetic number, because the mean of its divisors is an integer number (5232472).

Almost surely, 2^20916373 is an apocalyptic number.

It is an amenable number.

20916373 is a deficient number, since it is larger than the sum of its proper divisors (13515).

20916373 is a wasteful number, since it uses less digits than its factorization.

20916373 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13514.

The product of its (nonzero) digits is 6804, while the sum is 31.

The square root of 20916373 is about 4573.4421391333. The cubic root of 20916373 is about 275.5257073320.

It can be divided in two parts, 2091 and 6373, that added together give a square (8464 = 92²).

The spelling of 20916373 in words is "twenty million, nine hundred sixteen thousand, three hundred seventy-three".