20854537413 has 4 divisors (see below), whose sum is σ = 27806049888. Its totient is φ = 13903024940.

The previous prime is 20854537387. The next prime is 20854537471. The reversal of 20854537413 is 31473545802.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20854537413 - 2¹⁸ = 20854275269 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20854530413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3475756233 + ... + 3475756238.

It is an arithmetic number, because the mean of its divisors is an integer number (6951512472).

Almost surely, 2^20854537413 is an apocalyptic number.

It is an amenable number.

20854537413 is a deficient number, since it is larger than the sum of its proper divisors (6951512475).

20854537413 is an equidigital number, since it uses as much as digits as its factorization.

20854537413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6951512474.

The product of its (nonzero) digits is 403200, while the sum is 42.

The spelling of 20854537413 in words is "twenty billion, eight hundred fifty-four million, five hundred thirty-seven thousand, four hundred thirteen".