20987647948799 has 8 divisors (see below), whose sum is σ = 24133036030080. Its totient is φ = 17879048032536.

The previous prime is 20987647948759. The next prime is 20987647948831. The reversal of 20987647948799 is 99784974678902.

It is a happy number.

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 20987647948799 - 2¹⁶ = 20987647883263 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20987647948759) 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, 9197040029 + ... + 9197042310.

It is an arithmetic number, because the mean of its divisors is an integer number (3016629503760).

Almost surely, 2^{20987647948799} is an apocalyptic number.

20987647948799 is a deficient number, since it is larger than the sum of its proper divisors (3145388081281).

20987647948799 is a wasteful number, since it uses less digits than its factorization.

20987647948799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18394082509.

The product of its (nonzero) digits is 27653197824, while the sum is 89.

The spelling of 20987647948799 in words is "twenty trillion, nine hundred eighty-seven billion, six hundred forty-seven million, nine hundred forty-eight thousand, seven hundred ninety-nine".