20445678149 has 8 divisors (see below), whose sum is σ = 22186504032. Its totient is φ = 18728863920.

The previous prime is 20445678119. The next prime is 20445678173. The reversal of 20445678149 is 94187654402.

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

It is a de Polignac number, because none of the positive numbers 2^k-20445678149 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20445678097 and 20445678106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20445678119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6001139 + ... + 6004544.

It is an arithmetic number, because the mean of its divisors is an integer number (2773313004).

Almost surely, 2^20445678149 is an apocalyptic number.

It is an amenable number.

20445678149 is a deficient number, since it is larger than the sum of its proper divisors (1740825883).

20445678149 is a wasteful number, since it uses less digits than its factorization.

20445678149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12005827.

The product of its (nonzero) digits is 1935360, while the sum is 50.

The spelling of 20445678149 in words is "twenty billion, four hundred forty-five million, six hundred seventy-eight thousand, one hundred forty-nine".