20354740566049 has 4 divisors (see below), whose sum is σ = 21239729286336. Its totient is φ = 19469751845764.

The previous prime is 20354740566037. The next prime is 20354740566071. The reversal of 20354740566049 is 94066504745302.

It is a happy number.

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 20354740566049 - 2³⁷ = 20217301612577 is a prime.

It is a super-2 number, since 2×20354740566049² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20354740566089) 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, 442494360109 + ... + 442494360154.

It is an arithmetic number, because the mean of its divisors is an integer number (5309932321584).

Almost surely, 2^{20354740566049} is an apocalyptic number.

It is an amenable number.

20354740566049 is a deficient number, since it is larger than the sum of its proper divisors (884988720287).

20354740566049 is an equidigital number, since it uses as much as digits as its factorization.

20354740566049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 884988720286.

The product of its (nonzero) digits is 21772800, while the sum is 55.

The spelling of 20354740566049 in words is "twenty trillion, three hundred fifty-four billion, seven hundred forty million, five hundred sixty-six thousand, forty-nine".