20537893 has 8 divisors (see below), whose sum is σ = 20904408. Its totient is φ = 20173824.

The previous prime is 20537861. The next prime is 20537899. The reversal of 20537893 is 39873502.

It can be written as a sum of positive squares in 4 ways, for example, as 2712609 + 17825284 = 1647^2 + 4222^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20537893 - 2⁵ = 20537861 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 (20537899) 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 7 ways as a sum of consecutive naturals, for example, 25371 + ... + 26167.

It is an arithmetic number, because the mean of its divisors is an integer number (2613051).

Almost surely, 2^20537893 is an apocalyptic number.

It is an amenable number.

20537893 is a deficient number, since it is larger than the sum of its proper divisors (366515).

20537893 is an equidigital number, since it uses as much as digits as its factorization.

20537893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1223.

The product of its (nonzero) digits is 45360, while the sum is 37.

The square root of 20537893 is about 4531.8752189353. The cubic root of 20537893 is about 273.8537100703.

The spelling of 20537893 in words is "twenty million, five hundred thirty-seven thousand, eight hundred ninety-three".