20193654729 has 4 divisors (see below), whose sum is σ = 26924872976. Its totient is φ = 13462436484.

The previous prime is 20193654721. The next prime is 20193654743. The reversal of 20193654729 is 92745639102.

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 not a de Polignac number, because 20193654729 - 2³ = 20193654721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20193654721) 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, 3365609119 + ... + 3365609124.

It is an arithmetic number, because the mean of its divisors is an integer number (6731218244).

Almost surely, 2^20193654729 is an apocalyptic number.

It is an amenable number.

20193654729 is a deficient number, since it is larger than the sum of its proper divisors (6731218247).

20193654729 is an equidigital number, since it uses as much as digits as its factorization.

20193654729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6731218246.

The product of its (nonzero) digits is 816480, while the sum is 48.

The spelling of 20193654729 in words is "twenty billion, one hundred ninety-three million, six hundred fifty-four thousand, seven hundred twenty-nine".