20627587646 has 4 divisors (see below), whose sum is σ = 30941381472. Its totient is φ = 10313793822.

The previous prime is 20627587637. The next prime is 20627587693. The reversal of 20627587646 is 64678572602.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5156896910 + ... + 5156896913.

It is an arithmetic number, because the mean of its divisors is an integer number (7735345368).

Almost surely, 2^20627587646 is an apocalyptic number.

20627587646 is a deficient number, since it is larger than the sum of its proper divisors (10313793826).

20627587646 is a wasteful number, since it uses less digits than its factorization.

20627587646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10313793825.

The product of its (nonzero) digits is 6773760, while the sum is 53.

The spelling of 20627587646 in words is "twenty billion, six hundred twenty-seven million, five hundred eighty-seven thousand, six hundred forty-six".