20105656786766 has 8 divisors (see below), whose sum is σ = 30326968338120. Its totient is φ = 9996667340728.

The previous prime is 20105656786757. The next prime is 20105656786819. The reversal of 20105656786766 is 66768765650102.

It is a happy number.

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

It is a congruent number.

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, 28080525881 + ... + 28080526596.

It is an arithmetic number, because the mean of its divisors is an integer number (3790871042265).

Almost surely, 2^{20105656786766} is an apocalyptic number.

20105656786766 is a deficient number, since it is larger than the sum of its proper divisors (10221311551354).

20105656786766 is a wasteful number, since it uses less digits than its factorization.

20105656786766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56161052658.

The product of its (nonzero) digits is 152409600, while the sum is 65.

The spelling of 20105656786766 in words is "twenty trillion, one hundred five billion, six hundred fifty-six million, seven hundred eighty-six thousand, seven hundred sixty-six".