20747664626 has 16 divisors (see below), whose sum is σ = 33779364864. Its totient is φ = 9500443344.

The previous prime is 20747664551. The next prime is 20747664649. The reversal of 20747664626 is 62646674702.

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 7 ways as a sum of consecutive naturals, for example, 3138380 + ... + 3144983.

It is an arithmetic number, because the mean of its divisors is an integer number (2111210304).

Almost surely, 2^20747664626 is an apocalyptic number.

20747664626 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

20747664626 is a deficient number, since it is larger than the sum of its proper divisors (13031700238).

20747664626 is a wasteful number, since it uses less digits than its factorization.

20747664626 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6283505.

The product of its (nonzero) digits is 4064256, while the sum is 50.

The spelling of 20747664626 in words is "twenty billion, seven hundred forty-seven million, six hundred sixty-four thousand, six hundred twenty-six".