20554015444213 has 4 divisors (see below), whose sum is σ = 20554406606988. Its totient is φ = 20553624281440.

The previous prime is 20554015444201. The next prime is 20554015444243. The reversal of 20554015444213 is 31244451045502.

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 9726769975729 + 10827245468484 = 3118777^2 + 3290478^2 .

It is a cyclic number.

It is not a de Polignac number, because 20554015444213 - 2²¹ = 20554013347061 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20554015444243) 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, 195502558 + ... + 195607663.

It is an arithmetic number, because the mean of its divisors is an integer number (5138601651747).

Almost surely, 2^{20554015444213} is an apocalyptic number.

It is an amenable number.

20554015444213 is a deficient number, since it is larger than the sum of its proper divisors (391162775).

20554015444213 is an equidigital number, since it uses as much as digits as its factorization.

20554015444213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 391162774.

The product of its (nonzero) digits is 384000, while the sum is 40.

Adding to 20554015444213 its reverse (31244451045502), we get a palindrome (51798466489715).

The spelling of 20554015444213 in words is "twenty trillion, five hundred fifty-four billion, fifteen million, four hundred forty-four thousand, two hundred thirteen".