20147691408 has 80 divisors (see below), whose sum is σ = 56078452416. Its totient is φ = 6196354560.

The previous prime is 20147691407. The next prime is 20147691419. The reversal of 20147691408 is 80419674102.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 20147691408.

It is not an unprimeable number, because it can be changed into a prime (20147691407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1572966 + ... + 1585722.

Almost surely, 2^20147691408 is an apocalyptic number.

It is an amenable number.

20147691408 is an abundant number, since it is smaller than the sum of its proper divisors (35930761008).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20147691408 is a wasteful number, since it uses less digits than its factorization.

20147691408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15312 (or 15306 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 42.

The spelling of 20147691408 in words is "twenty billion, one hundred forty-seven million, six hundred ninety-one thousand, four hundred eight".