20556154609193 has 4 divisors (see below), whose sum is σ = 23492748124800. Its totient is φ = 17619561093588.

The previous prime is 20556154609189. The next prime is 20556154609201. The reversal of 20556154609193 is 39190645165502.

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 20556154609193 - 2² = 20556154609189 is a prime.

It is a super-2 number, since 2×20556154609193² (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 (20556154609103) 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, 1468296757793 + ... + 1468296757806.

It is an arithmetic number, because the mean of its divisors is an integer number (5873187031200).

Almost surely, 2^{20556154609193} is an apocalyptic number.

It is an amenable number.

20556154609193 is a deficient number, since it is larger than the sum of its proper divisors (2936593515607).

20556154609193 is an equidigital number, since it uses as much as digits as its factorization.

20556154609193 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2936593515606.

The product of its (nonzero) digits is 8748000, while the sum is 56.

The spelling of 20556154609193 in words is "twenty trillion, five hundred fifty-six billion, one hundred fifty-four million, six hundred nine thousand, one hundred ninety-three".