20439373 has 4 divisors (see below), whose sum is σ = 20576700. Its totient is φ = 20302048.

The previous prime is 20439347. The next prime is 20439379. The reversal of 20439373 is 37393402.

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 6874884 + 13564489 = 2622^2 + 3683^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20439373 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 (20439379) 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, 68440 + ... + 68737.

It is an arithmetic number, because the mean of its divisors is an integer number (5144175).

Almost surely, 2^20439373 is an apocalyptic number.

It is an amenable number.

20439373 is a deficient number, since it is larger than the sum of its proper divisors (137327).

20439373 is a wasteful number, since it uses less digits than its factorization.

20439373 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137326.

The product of its (nonzero) digits is 13608, while the sum is 31.

The square root of 20439373 is about 4520.9924795337. The cubic root of 20439373 is about 273.4151171425.

The spelling of 20439373 in words is "twenty million, four hundred thirty-nine thousand, three hundred seventy-three".