20194476553 has 4 divisors (see below), whose sum is σ = 21257343760. Its totient is φ = 19131609348.

The previous prime is 20194476541. The next prime is 20194476563. The reversal of 20194476553 is 35567449102.

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, and also an emirpimes, since its reverse is a distinct semiprime: 35567449102 = 2 ⋅17783724551.

It is a cyclic number.

It is not a de Polignac number, because 20194476553 - 2⁵ = 20194476521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20194476563) 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, 531433575 + ... + 531433612.

It is an arithmetic number, because the mean of its divisors is an integer number (5314335940).

Almost surely, 2^20194476553 is an apocalyptic number.

It is an amenable number.

20194476553 is a deficient number, since it is larger than the sum of its proper divisors (1062867207).

20194476553 is a wasteful number, since it uses less digits than its factorization.

20194476553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1062867206.

The product of its (nonzero) digits is 907200, while the sum is 46.

The spelling of 20194476553 in words is "twenty billion, one hundred ninety-four million, four hundred seventy-six thousand, five hundred fifty-three".