20689188153 has 4 divisors (see below), whose sum is σ = 27585584208. Its totient is φ = 13792792100.

The previous prime is 20689188133. The next prime is 20689188161. The reversal of 20689188153 is 35188198602.

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 20689188153 - 2⁹ = 20689187641 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20689188096 and 20689188105.

It is not an unprimeable number, because it can be changed into a prime (20689188133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3448198023 + ... + 3448198028.

It is an arithmetic number, because the mean of its divisors is an integer number (6896396052).

Almost surely, 2^20689188153 is an apocalyptic number.

It is an amenable number.

20689188153 is a deficient number, since it is larger than the sum of its proper divisors (6896396055).

20689188153 is an equidigital number, since it uses as much as digits as its factorization.

20689188153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6896396054.

The product of its (nonzero) digits is 829440, while the sum is 51.

The spelling of 20689188153 in words is "twenty billion, six hundred eighty-nine million, one hundred eighty-eight thousand, one hundred fifty-three".