20956373 has 4 divisors (see below), whose sum is σ = 22059360. Its totient is φ = 19853388.

The previous prime is 20956343. The next prime is 20956379. The reversal of 20956373 is 37365902.

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 20956373 - 2¹² = 20952277 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20956379) 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, 551465 + ... + 551502.

It is an arithmetic number, because the mean of its divisors is an integer number (5514840).

Almost surely, 2^20956373 is an apocalyptic number.

It is an amenable number.

20956373 is a deficient number, since it is larger than the sum of its proper divisors (1102987).

20956373 is a wasteful number, since it uses less digits than its factorization.

20956373 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1102986.

The product of its (nonzero) digits is 34020, while the sum is 35.

The square root of 20956373 is about 4577.8131241893. The cubic root of 20956373 is about 275.7012318727.

The spelling of 20956373 in words is "twenty million, nine hundred fifty-six thousand, three hundred seventy-three".