20989823689811 has 8 divisors (see below), whose sum is σ = 21057512190624. Its totient is φ = 20922136453120.

The previous prime is 20989823689789. The next prime is 20989823689841. The reversal of 20989823689811 is 11898632898902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20989823689811 - 2²² = 20989819495507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20989823689841) 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, 42108245 + ... + 42603801.

It is an arithmetic number, because the mean of its divisors is an integer number (2632189023828).

Almost surely, 2^{20989823689811} is an apocalyptic number.

20989823689811 is a deficient number, since it is larger than the sum of its proper divisors (67688500813).

20989823689811 is a wasteful number, since it uses less digits than its factorization.

20989823689811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 632061.

The product of its (nonzero) digits is 214990848, while the sum is 74.

The spelling of 20989823689811 in words is "twenty trillion, nine hundred eighty-nine billion, eight hundred twenty-three million, six hundred eighty-nine thousand, eight hundred eleven".