20520153324403 has 4 divisors (see below), whose sum is σ = 20520327869368. Its totient is φ = 20519978779440.

The previous prime is 20520153324323. The next prime is 20520153324413. The reversal of 20520153324403 is 30442335102502.

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 20520153324403 - 2²⁹ = 20519616453491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20520153324413) 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, 87096018 + ... + 87331303.

It is an arithmetic number, because the mean of its divisors is an integer number (5130081967342).

Almost surely, 2^{20520153324403} is an apocalyptic number.

20520153324403 is a deficient number, since it is larger than the sum of its proper divisors (174544965).

20520153324403 is a wasteful number, since it uses less digits than its factorization.

20520153324403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174544964.

The product of its (nonzero) digits is 86400, while the sum is 34.

Adding to 20520153324403 its reverse (30442335102502), we get a palindrome (50962488426905).

The spelling of 20520153324403 in words is "twenty trillion, five hundred twenty billion, one hundred fifty-three million, three hundred twenty-four thousand, four hundred three".