20685763078 has 4 divisors (see below), whose sum is σ = 31028644620. Its totient is φ = 10342881538.

The previous prime is 20685763073. The next prime is 20685763129. The reversal of 20685763078 is 87036758602.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20685763073) by changing a digit.

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 as a sum of consecutive naturals, namely, 5171440768 + ... + 5171440771.

It is an arithmetic number, because the mean of its divisors is an integer number (7757161155).

Almost surely, 2^20685763078 is an apocalyptic number.

20685763078 is a deficient number, since it is larger than the sum of its proper divisors (10342881542).

20685763078 is a wasteful number, since it uses less digits than its factorization.

20685763078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10342881541.

The product of its (nonzero) digits is 3386880, while the sum is 52.

The spelling of 20685763078 in words is "twenty billion, six hundred eighty-five million, seven hundred sixty-three thousand, seventy-eight".