20989998363 has 32 divisors (see below), whose sum is σ = 29265442560. Its totient is φ = 13364785280.

The previous prime is 20989998353. The next prime is 20989998373. The reversal of 20989998363 is 36389998902.

It is an interprime number because it is at equal distance from previous prime (20989998353) and next prime (20989998373).

It is a cyclic number.

It is not a de Polignac number, because 20989998363 - 2²¹ = 20987901211 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20989998294 and 20989998303.

It is not an unprimeable number, because it can be changed into a prime (20989998353) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8814433 + ... + 8816813.

It is an arithmetic number, because the mean of its divisors is an integer number (914545080).

Almost surely, 2^20989998363 is an apocalyptic number.

20989998363 is a deficient number, since it is larger than the sum of its proper divisors (8275444197).

20989998363 is a wasteful number, since it uses less digits than its factorization.

20989998363 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3467.

The product of its (nonzero) digits is 45349632, while the sum is 66.

The spelling of 20989998363 in words is "twenty billion, nine hundred eighty-nine million, nine hundred ninety-eight thousand, three hundred sixty-three".