20137493 has 4 divisors (see below), whose sum is σ = 20284620. Its totient is φ = 19990368.

The previous prime is 20137487. The next prime is 20137541. The reversal of 20137493 is 39473102.

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 8427409 + 11710084 = 2903^2 + 3422^2 .

It is a cyclic number.

It is not a de Polignac number, because 20137493 - 2⁴ = 20137477 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 (20137433) 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, 73358 + ... + 73631.

It is an arithmetic number, because the mean of its divisors is an integer number (5071155).

Almost surely, 2^20137493 is an apocalyptic number.

It is an amenable number.

20137493 is a deficient number, since it is larger than the sum of its proper divisors (147127).

20137493 is a wasteful number, since it uses less digits than its factorization.

20137493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147126.

The product of its (nonzero) digits is 4536, while the sum is 29.

The square root of 20137493 is about 4487.4818105481. The cubic root of 20137493 is about 272.0623640522.

The spelling of 20137493 in words is "twenty million, one hundred thirty-seven thousand, four hundred ninety-three".