20155230503 has 4 divisors (see below), whose sum is σ = 20243244840. Its totient is φ = 20067216168.

The previous prime is 20155230461. The next prime is 20155230539. The reversal of 20155230503 is 30503255102.

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 20155230503 - 2⁸ = 20155230247 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 (20155230703) 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, 44006825 + ... + 44007282.

It is an arithmetic number, because the mean of its divisors is an integer number (5060811210).

Almost surely, 2^20155230503 is an apocalyptic number.

20155230503 is a deficient number, since it is larger than the sum of its proper divisors (88014337).

20155230503 is an equidigital number, since it uses as much as digits as its factorization.

20155230503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88014336.

The product of its (nonzero) digits is 4500, while the sum is 26.

Adding to 20155230503 its reverse (30503255102), we get a palindrome (50658485605).

The spelling of 20155230503 in words is "twenty billion, one hundred fifty-five million, two hundred thirty thousand, five hundred three".