20742989878 has 16 divisors (see below), whose sum is σ = 33884403840. Its totient is φ = 9466117056.

The previous prime is 20742989873. The next prime is 20742989879. The reversal of 20742989878 is 87898924702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20742989873) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4479750 + ... + 4484377.

It is an arithmetic number, because the mean of its divisors is an integer number (2117775240).

Almost surely, 2^20742989878 is an apocalyptic number.

20742989878 is a deficient number, since it is larger than the sum of its proper divisors (13141413962).

20742989878 is a wasteful number, since it uses less digits than its factorization.

20742989878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8964231.

The product of its (nonzero) digits is 32514048, while the sum is 64.

The spelling of 20742989878 in words is "twenty billion, seven hundred forty-two million, nine hundred eighty-nine thousand, eight hundred seventy-eight".