20503502465 has 4 divisors (see below), whose sum is σ = 24604202964. Its totient is φ = 16402801968.

The previous prime is 20503502441. The next prime is 20503502473. The reversal of 20503502465 is 56420530502.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10142705521 + 10360796944 = 100711^2 + 101788^2 .

It is a cyclic number.

It is not a de Polignac number, because 20503502465 - 2⁸ = 20503502209 is a prime.

It is a super-2 number, since 2×20503502465² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2050350242 + ... + 2050350251.

It is an arithmetic number, because the mean of its divisors is an integer number (6151050741).

Almost surely, 2^20503502465 is an apocalyptic number.

It is an amenable number.

20503502465 is a deficient number, since it is larger than the sum of its proper divisors (4100700499).

20503502465 is an equidigital number, since it uses as much as digits as its factorization.

20503502465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4100700498.

The product of its (nonzero) digits is 36000, while the sum is 32.

The spelling of 20503502465 in words is "twenty billion, five hundred three million, five hundred two thousand, four hundred sixty-five".