20355525013 has 4 divisors (see below), whose sum is σ = 20374081740. Its totient is φ = 20336968288.

The previous prime is 20355525011. The next prime is 20355525031. The reversal of 20355525013 is 31052555302.

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 9587934724 + 10767590289 = 97918^2 + 103767^2 .

It is a cyclic number.

It is not a de Polignac number, because 20355525013 - 2¹ = 20355525011 is a prime.

It is a super-3 number, since 3×20355525013³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20355525011) 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, 9276718 + ... + 9278911.

It is an arithmetic number, because the mean of its divisors is an integer number (5093520435).

Almost surely, 2^20355525013 is an apocalyptic number.

It is an amenable number.

20355525013 is a deficient number, since it is larger than the sum of its proper divisors (18556727).

20355525013 is a wasteful number, since it uses less digits than its factorization.

20355525013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18556726.

The product of its (nonzero) digits is 22500, while the sum is 31.

The spelling of 20355525013 in words is "twenty billion, three hundred fifty-five million, five hundred twenty-five thousand, thirteen".