20149201647 has 12 divisors (see below), whose sum is σ = 29361964944. Its totient is φ = 13313926080.

The previous prime is 20149201619. The next prime is 20149201661. The reversal of 20149201647 is 74610294102.

It is a happy number.

20149201647 is a `hidden beast` number, since 2 + 0 + 1 + 4 + 9 + 2 + 0 + 1 + 647 = 666.

It is not a de Polignac number, because 20149201647 - 2¹¹ = 20149199599 is a prime.

It is a super-2 number, since 2×20149201647² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20149201607) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9905179 + ... + 9907212.

It is an arithmetic number, because the mean of its divisors is an integer number (2446830412).

Almost surely, 2^20149201647 is an apocalyptic number.

20149201647 is a deficient number, since it is larger than the sum of its proper divisors (9212763297).

20149201647 is a wasteful number, since it uses less digits than its factorization.

20149201647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19812510 (or 19812507 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

Adding to 20149201647 its reverse (74610294102), we get a palindrome (94759495749).

The spelling of 20149201647 in words is "twenty billion, one hundred forty-nine million, two hundred one thousand, six hundred forty-seven".