20751373 has 4 divisors (see below), whose sum is σ = 21972060. Its totient is φ = 19530688.

The previous prime is 20751361. The next prime is 20751391. The reversal of 20751373 is 37315702.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11035684 + 9715689 = 3322^2 + 3117^2 .

It is not a de Polignac number, because 20751373 - 2¹³ = 20743181 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20751343) 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, 610318 + ... + 610351.

It is an arithmetic number, because the mean of its divisors is an integer number (5493015).

Almost surely, 2^20751373 is an apocalyptic number.

It is an amenable number.

20751373 is a deficient number, since it is larger than the sum of its proper divisors (1220687).

20751373 is a wasteful number, since it uses less digits than its factorization.

20751373 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1220686.

The product of its (nonzero) digits is 4410, while the sum is 28.

The square root of 20751373 is about 4555.3674934082. The cubic root of 20751373 is about 274.7992937724.

The spelling of 20751373 in words is "twenty million, seven hundred fifty-one thousand, three hundred seventy-three".