20980761988 has 6 divisors (see below), whose sum is σ = 36716333486. Its totient is φ = 10490380992.

The previous prime is 20980761983. The next prime is 20980762003. The reversal of 20980761988 is 88916708902.

It can be written as a sum of positive squares in only one way, i.e., 20257259584 + 723502404 = 142328^2 + 26898^2 .

It is not an unprimeable number, because it can be changed into a prime (20980761983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2622595245 + ... + 2622595252.

Almost surely, 2^20980761988 is an apocalyptic number.

It is an amenable number.

20980761988 is a deficient number, since it is larger than the sum of its proper divisors (15735571498).

20980761988 is a wasteful number, since it uses less digits than its factorization.

20980761988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5245190501 (or 5245190499 counting only the distinct ones).

The product of its (nonzero) digits is 3483648, while the sum is 58.

The spelling of 20980761988 in words is "twenty billion, nine hundred eighty million, seven hundred sixty-one thousand, nine hundred eighty-eight".