20403545321 has 4 divisors (see below), whose sum is σ = 20403831552. Its totient is φ = 20403259092.

The previous prime is 20403545317. The next prime is 20403545353. The reversal of 20403545321 is 12354530402.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 12354530402 = 2 ⋅6177265201.

It is a cyclic number.

It is not a de Polignac number, because 20403545321 - 2² = 20403545317 is a prime.

It is a super-3 number, since 3×20403545321³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20403545221) 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, 58280 + ... + 210246.

It is an arithmetic number, because the mean of its divisors is an integer number (5100957888).

Almost surely, 2^20403545321 is an apocalyptic number.

It is an amenable number.

20403545321 is a deficient number, since it is larger than the sum of its proper divisors (286231).

20403545321 is a wasteful number, since it uses less digits than its factorization.

20403545321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286230.

The product of its (nonzero) digits is 14400, while the sum is 29.

The spelling of 20403545321 in words is "twenty billion, four hundred three million, five hundred forty-five thousand, three hundred twenty-one".