20043157 has 4 divisors (see below), whose sum is σ = 21098080. Its totient is φ = 18988236.

The previous prime is 20043151. The next prime is 20043161. The reversal of 20043157 is 75134002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20043157 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 (20043151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 527433 + ... + 527470.

It is an arithmetic number, because the mean of its divisors is an integer number (5274520).

Almost surely, 2^20043157 is an apocalyptic number.

It is an amenable number.

20043157 is a deficient number, since it is larger than the sum of its proper divisors (1054923).

20043157 is a wasteful number, since it uses less digits than its factorization.

20043157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1054922.

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 20043157 is about 4476.9584541293. The cubic root of 20043157 is about 271.6368649273.

Adding to 20043157 its reverse (75134002), we get a palindrome (95177159).

The spelling of 20043157 in words is "twenty million, forty-three thousand, one hundred fifty-seven".