20549155158194 has 8 divisors (see below), whose sum is σ = 33194789101740. Its totient is φ = 9484225457616.

The previous prime is 20549155158151. The next prime is 20549155158199. The reversal of 20549155158194 is 49185155194502.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 19857388682569 + 691766475625 = 4456163^2 + 831725^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (20549155158199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 395176060709 + ... + 395176060760.

Almost surely, 2^{20549155158194} is an apocalyptic number.

20549155158194 is a deficient number, since it is larger than the sum of its proper divisors (12645633943546).

20549155158194 is a wasteful number, since it uses less digits than its factorization.

20549155158194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 790352121484.

The product of its (nonzero) digits is 12960000, while the sum is 59.

The spelling of 20549155158194 in words is "twenty trillion, five hundred forty-nine billion, one hundred fifty-five million, one hundred fifty-eight thousand, one hundred ninety-four".