20003504421 has 4 divisors (see below), whose sum is σ = 26671339232. Its totient is φ = 13335669612.

The previous prime is 20003504387. The next prime is 20003504471. The reversal of 20003504421 is 12440530002.

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 not a de Polignac number, because 20003504421 - 2⁷ = 20003504293 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 (20003504471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3333917401 + ... + 3333917406.

It is an arithmetic number, because the mean of its divisors is an integer number (6667834808).

Almost surely, 2^20003504421 is an apocalyptic number.

It is an amenable number.

20003504421 is a deficient number, since it is larger than the sum of its proper divisors (6667834811).

20003504421 is an equidigital number, since it uses as much as digits as its factorization.

20003504421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6667834810.

The product of its (nonzero) digits is 960, while the sum is 21.

The spelling of 20003504421 in words is "twenty billion, three million, five hundred four thousand, four hundred twenty-one".