20005434421 has 4 divisors (see below), whose sum is σ = 22863353632. Its totient is φ = 17147515212.

The previous prime is 20005434389. The next prime is 20005434433. The reversal of 20005434421 is 12443450002.

It is a happy number.

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 20005434421 - 2⁵ = 20005434389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20005434481) 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, 1428959595 + ... + 1428959608.

It is an arithmetic number, because the mean of its divisors is an integer number (5715838408).

Almost surely, 2^20005434421 is an apocalyptic number.

It is an amenable number.

20005434421 is a deficient number, since it is larger than the sum of its proper divisors (2857919211).

20005434421 is an equidigital number, since it uses as much as digits as its factorization.

20005434421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2857919210.

The product of its (nonzero) digits is 3840, while the sum is 25.

Adding to 20005434421 its reverse (12443450002), we get a palindrome (32448884423).

The spelling of 20005434421 in words is "twenty billion, five million, four hundred thirty-four thousand, four hundred twenty-one".