20031810493 has 4 divisors (see below), whose sum is σ = 20106278460. Its totient is φ = 19957342528.

The previous prime is 20031810443. The next prime is 20031810497. The reversal of 20031810493 is 39401813002.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1651772164 + 18380038329 = 40642^2 + 135573^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20031810493 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 (20031810497) 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, 37233580 + ... + 37234117.

It is an arithmetic number, because the mean of its divisors is an integer number (5026569615).

Almost surely, 2^20031810493 is an apocalyptic number.

It is an amenable number.

20031810493 is a deficient number, since it is larger than the sum of its proper divisors (74467967).

20031810493 is an equidigital number, since it uses as much as digits as its factorization.

20031810493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74467966.

The product of its (nonzero) digits is 5184, while the sum is 31.

The spelling of 20031810493 in words is "twenty billion, thirty-one million, eight hundred ten thousand, four hundred ninety-three".