20043953 has 4 divisors (see below), whose sum is σ = 20159988. Its totient is φ = 19927920.

The previous prime is 20043937. The next prime is 20043967. The reversal of 20043953 is 35934002.

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 7772944 + 12271009 = 2788^2 + 3503^2 .

It is a cyclic number.

It is not a de Polignac number, because 20043953 - 2⁴ = 20043937 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20043913) 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, 57758 + ... + 58103.

It is an arithmetic number, because the mean of its divisors is an integer number (5039997).

Almost surely, 2^20043953 is an apocalyptic number.

It is an amenable number.

20043953 is a deficient number, since it is larger than the sum of its proper divisors (116035).

20043953 is a wasteful number, since it uses less digits than its factorization.

20043953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116034.

The product of its (nonzero) digits is 3240, while the sum is 26.

The square root of 20043953 is about 4477.0473528878. The cubic root of 20043953 is about 271.6404608359.

Adding to 20043953 its reverse (35934002), we get a palindrome (55977955).

The spelling of 20043953 in words is "twenty million, forty-three thousand, nine hundred fifty-three".