20247547356164 has 24 divisors (see below), whose sum is σ = 35473134465048. Its totient is φ = 10112371914240.

The previous prime is 20247547356161. The next prime is 20247547356181. The reversal of 20247547356164 is 46165374574202.

It can be written as a sum of positive squares in 4 ways, for example, as 1615547765764 + 18631999590400 = 1271042^2 + 4316480^2 .

It is not an unprimeable number, because it can be changed into a prime (20247547356161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13193042 + ... + 14647574.

It is an arithmetic number, because the mean of its divisors is an integer number (1478047269377).

Almost surely, 2^{20247547356164} is an apocalyptic number.

It is an amenable number.

20247547356164 is a deficient number, since it is larger than the sum of its proper divisors (15225587108884).

20247547356164 is a wasteful number, since it uses less digits than its factorization.

20247547356164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1458455 (or 1458453 counting only the distinct ones).

The product of its (nonzero) digits is 33868800, while the sum is 56.

The spelling of 20247547356164 in words is "twenty trillion, two hundred forty-seven billion, five hundred forty-seven million, three hundred fifty-six thousand, one hundred sixty-four".