20136643423 has 8 divisors (see below), whose sum is σ = 21738642800. Its totient is φ = 18542219328.

The previous prime is 20136643409. The next prime is 20136643453. The reversal of 20136643423 is 32434663102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20136643423 - 2¹³ = 20136635231 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20136643453) 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 7 ways as a sum of consecutive naturals, for example, 1888293 + ... + 1898926.

It is an arithmetic number, because the mean of its divisors is an integer number (2717330350).

Almost surely, 2^20136643423 is an apocalyptic number.

20136643423 is a deficient number, since it is larger than the sum of its proper divisors (1601999377).

20136643423 is a wasteful number, since it uses less digits than its factorization.

20136643423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3787641.

The product of its (nonzero) digits is 62208, while the sum is 34.

The spelling of 20136643423 in words is "twenty billion, one hundred thirty-six million, six hundred forty-three thousand, four hundred twenty-three".