20708756078 has 4 divisors (see below), whose sum is σ = 31063134120. Its totient is φ = 10354378038.

The previous prime is 20708756069. The next prime is 20708756113. The reversal of 20708756078 is 87065780702.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87065780702 = 2 ⋅43532890351.

It is a congruent number.

It is an unprimeable number.

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, 5177189018 + ... + 5177189021.

It is an arithmetic number, because the mean of its divisors is an integer number (7765783530).

Almost surely, 2^20708756078 is an apocalyptic number.

20708756078 is a deficient number, since it is larger than the sum of its proper divisors (10354378042).

20708756078 is a wasteful number, since it uses less digits than its factorization.

20708756078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10354378041.

The product of its (nonzero) digits is 1317120, while the sum is 50.

The spelling of 20708756078 in words is "twenty billion, seven hundred eight million, seven hundred fifty-six thousand, seventy-eight".