20031434321 has 4 divisors (see below), whose sum is σ = 20902366272. Its totient is φ = 19160502372.

The previous prime is 20031434317. The next prime is 20031434347. The reversal of 20031434321 is 12343413002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20031434321 - 2² = 20031434317 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 870931927 = 20031434321 / (2 + 0 + 0 + 3 + 1 + 4 + 3 + 4 + 3 + 2 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20031434351) 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, 435465941 + ... + 435465986.

It is an arithmetic number, because the mean of its divisors is an integer number (5225591568).

Almost surely, 2^20031434321 is an apocalyptic number.

It is an amenable number.

20031434321 is a deficient number, since it is larger than the sum of its proper divisors (870931951).

20031434321 is an equidigital number, since it uses as much as digits as its factorization.

20031434321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 870931950.

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 20031434321 its reverse (12343413002), we get a palindrome (32374847323).

The spelling of 20031434321 in words is "twenty billion, thirty-one million, four hundred thirty-four thousand, three hundred twenty-one".