20381748149 has 16 divisors (see below), whose sum is σ = 24871452672. Its totient is φ = 16321879728.

The previous prime is 20381748139. The next prime is 20381748161. The reversal of 20381748149 is 94184718302.

It is a de Polignac number, because none of the positive numbers 2^k-20381748149 is a prime.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20381748119) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1465109 + ... + 1478954.

It is an arithmetic number, because the mean of its divisors is an integer number (1554465792).

Almost surely, 2^20381748149 is an apocalyptic number.

It is an amenable number.

20381748149 is a deficient number, since it is larger than the sum of its proper divisors (4489704523).

20381748149 is a wasteful number, since it uses less digits than its factorization.

20381748149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2944136.

The product of its (nonzero) digits is 387072, while the sum is 47.

The spelling of 20381748149 in words is "twenty billion, three hundred eighty-one million, seven hundred forty-eight thousand, one hundred forty-nine".