20409789503 has 4 divisors (see below), whose sum is σ = 20410131048. Its totient is φ = 20409447960.

The previous prime is 20409789487. The next prime is 20409789539. The reversal of 20409789503 is 30598790402.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30598790402 = 2 ⋅15299395201.

It is a cyclic number.

It is not a de Polignac number, because 20409789503 - 2⁴ = 20409789487 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 (20409789203) 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, 54953 + ... + 209378.

It is an arithmetic number, because the mean of its divisors is an integer number (5102532762).

Almost surely, 2^20409789503 is an apocalyptic number.

20409789503 is a deficient number, since it is larger than the sum of its proper divisors (341545).

20409789503 is an equidigital number, since it uses as much as digits as its factorization.

20409789503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 341544.

The product of its (nonzero) digits is 544320, while the sum is 47.

The spelling of 20409789503 in words is "twenty billion, four hundred nine million, seven hundred eighty-nine thousand, five hundred three".