20147643775 has 24 divisors (see below), whose sum is σ = 28574358624. Its totient is φ = 13804752000.

The previous prime is 20147643749. The next prime is 20147643839. The reversal of 20147643775 is 57734674102.

It is not a de Polignac number, because 20147643775 - 2⁷ = 20147643647 is a prime.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 183429 + ... + 271921.

It is an arithmetic number, because the mean of its divisors is an integer number (1190598276).

Almost surely, 2^20147643775 is an apocalyptic number.

20147643775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20147643775 is a deficient number, since it is larger than the sum of its proper divisors (8426714849).

20147643775 is a wasteful number, since it uses less digits than its factorization.

20147643775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89811 (or 89806 counting only the distinct ones).

The product of its (nonzero) digits is 987840, while the sum is 46.

The spelling of 20147643775 in words is "twenty billion, one hundred forty-seven million, six hundred forty-three thousand, seven hundred seventy-five".