20142503 has 4 divisors (see below), whose sum is σ = 21018288. Its totient is φ = 19266720.

The previous prime is 20142481. The next prime is 20142509. The reversal of 20142503 is 30524102.

20142503 is nontrivially palindromic in base 7.

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

It is a cyclic number.

It is not a de Polignac number, because 20142503 - 2⁸ = 20142247 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 (20142509) 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, 437858 + ... + 437903.

It is an arithmetic number, because the mean of its divisors is an integer number (5254572).

Almost surely, 2^20142503 is an apocalyptic number.

20142503 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

20142503 is a deficient number, since it is larger than the sum of its proper divisors (875785).

20142503 is an equidigital number, since it uses as much as digits as its factorization.

20142503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 875784.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 20142503 is about 4488.0399953655. The cubic root of 20142503 is about 272.0849242822.

Adding to 20142503 its reverse (30524102), we get a palindrome (50666605).

The spelling of 20142503 in words is "twenty million, one hundred forty-two thousand, five hundred three".