20688748786 has 8 divisors (see below), whose sum is σ = 31062994560. Its totient is φ = 10334417268.

The previous prime is 20688748777. The next prime is 20688748793. The reversal of 20688748786 is 68784788602.

It is a happy number.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4975966 + ... + 4980121.

It is an arithmetic number, because the mean of its divisors is an integer number (3882874320).

Almost surely, 2^20688748786 is an apocalyptic number.

20688748786 is a deficient number, since it is larger than the sum of its proper divisors (10374245774).

20688748786 is a wasteful number, since it uses less digits than its factorization.

20688748786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9957128.

The product of its (nonzero) digits is 57802752, while the sum is 64.

The spelling of 20688748786 in words is "twenty billion, six hundred eighty-eight million, seven hundred forty-eight thousand, seven hundred eighty-six".