20157103 has 4 divisors (see below), whose sum is σ = 20169720. Its totient is φ = 20144488.

The previous prime is 20157097. The next prime is 20157107. The reversal of 20157103 is 30175102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20157103 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 (20157107) 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, 3493 + ... + 7246.

It is an arithmetic number, because the mean of its divisors is an integer number (5042430).

Almost surely, 2^20157103 is an apocalyptic number.

20157103 is a deficient number, since it is larger than the sum of its proper divisors (12617).

20157103 is a wasteful number, since it uses less digits than its factorization.

20157103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12616.

The product of its (nonzero) digits is 210, while the sum is 19.

The square root of 20157103 is about 4489.6662459475. Note that the first 3 decimals coincide. The cubic root of 20157103 is about 272.1506473371.

The spelling of 20157103 in words is "twenty million, one hundred fifty-seven thousand, one hundred three".