20747664625 has 32 divisors (see below), whose sum is σ = 27061542144. Its totient is φ = 15851404800.

The previous prime is 20747664551. The next prime is 20747664649. The reversal of 20747664625 is 52646674702.

It is not a de Polignac number, because 20747664625 - 2¹¹ = 20747662577 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 1929514 + ... + 1940236.

It is an arithmetic number, because the mean of its divisors is an integer number (845673192).

Almost surely, 2^20747664625 is an apocalyptic number.

20747664625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20747664625 is a deficient number, since it is larger than the sum of its proper divisors (6313877519).

20747664625 is a wasteful number, since it uses less digits than its factorization.

20747664625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11434 (or 11424 counting only the distinct ones).

The product of its (nonzero) digits is 3386880, while the sum is 49.

The spelling of 20747664625 in words is "twenty billion, seven hundred forty-seven million, six hundred sixty-four thousand, six hundred twenty-five".