20748693646 has 8 divisors (see below), whose sum is σ = 31281026040. Its totient is φ = 10321684968.

The previous prime is 20748693643. The next prime is 20748693653. The reversal of 20748693646 is 64639684702.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20748693643) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 26330436 + ... + 26331223.

It is an arithmetic number, because the mean of its divisors is an integer number (3910128255).

Almost surely, 2^20748693646 is an apocalyptic number.

20748693646 is a deficient number, since it is larger than the sum of its proper divisors (10532332394).

20748693646 is a wasteful number, since it uses less digits than its factorization.

20748693646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52661858.

The product of its (nonzero) digits is 10450944, while the sum is 55.

The spelling of 20748693646 in words is "twenty billion, seven hundred forty-eight million, six hundred ninety-three thousand, six hundred forty-six".