20042171503 has 16 divisors (see below), whose sum is σ = 21002844096. Its totient is φ = 19089100800.

The previous prime is 20042171483. The next prime is 20042171509. The reversal of 20042171503 is 30517124002.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20042171503 - 2⁹ = 20042170991 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 (20042171509) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9307875 + ... + 9310027.

It is an arithmetic number, because the mean of its divisors is an integer number (1312677756).

Almost surely, 2^20042171503 is an apocalyptic number.

20042171503 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

20042171503 is a deficient number, since it is larger than the sum of its proper divisors (960672593).

20042171503 is a wasteful number, since it uses less digits than its factorization.

20042171503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3714.

The product of its (nonzero) digits is 1680, while the sum is 25.

Adding to 20042171503 its reverse (30517124002), we get a palindrome (50559295505).

The spelling of 20042171503 in words is "twenty billion, forty-two million, one hundred seventy-one thousand, five hundred three".