20078977834 has 32 divisors (see below), whose sum is σ = 31446694800. Its totient is φ = 9603471360.

The previous prime is 20078977811. The next prime is 20078977837. The reversal of 20078977834 is 43877987002.

It can be written as a sum of positive squares in 8 ways, for example, as 6407522209 + 13671455625 = 80047^2 + 116925^2 .

It is not an unprimeable number, because it can be changed into a prime (20078977837) 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 in 15 ways as a sum of consecutive naturals, for example, 4519054 + ... + 4523494.

Almost surely, 2^20078977834 is an apocalyptic number.

20078977834 is a deficient number, since it is larger than the sum of its proper divisors (11367716966).

20078977834 is a wasteful number, since it uses less digits than its factorization.

20078977834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5178.

The product of its (nonzero) digits is 4741632, while the sum is 55.

The spelling of 20078977834 in words is "twenty billion, seventy-eight million, nine hundred seventy-seven thousand, eight hundred thirty-four".