20513562403 has 4 divisors (see below), whose sum is σ = 20514154960. Its totient is φ = 20512969848.

The previous prime is 20513562383. The next prime is 20513562427. The reversal of 20513562403 is 30426531502.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 20513562403 - 2³³ = 11923627811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20513562473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 240900 + ... + 314737.

It is an arithmetic number, because the mean of its divisors is an integer number (5128538740).

Almost surely, 2^20513562403 is an apocalyptic number.

20513562403 is a deficient number, since it is larger than the sum of its proper divisors (592557).

20513562403 is an equidigital number, since it uses as much as digits as its factorization.

20513562403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 592556.

The product of its (nonzero) digits is 21600, while the sum is 31.

The spelling of 20513562403 in words is "twenty billion, five hundred thirteen million, five hundred sixty-two thousand, four hundred three".