20117621455198 has 16 divisors (see below), whose sum is σ = 31682924171280. Its totient is φ = 9567000628416.

The previous prime is 20117621455187. The next prime is 20117621455201. The reversal of 20117621455198 is 89155412671102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2588470311 + ... + 2588478082.

It is an arithmetic number, because the mean of its divisors is an integer number (1980182760705).

Almost surely, 2^{20117621455198} is an apocalyptic number.

20117621455198 is a deficient number, since it is larger than the sum of its proper divisors (11565302716082).

20117621455198 is a wasteful number, since it uses less digits than its factorization.

20117621455198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5176948491.

The product of its (nonzero) digits is 1209600, while the sum is 52.

The spelling of 20117621455198 in words is "twenty trillion, one hundred seventeen billion, six hundred twenty-one million, four hundred fifty-five thousand, one hundred ninety-eight".