20986446997 has 8 divisors (see below), whose sum is σ = 21250950336. Its totient is φ = 20722221312.

The previous prime is 20986446989. The next prime is 20986447021. The reversal of 20986446997 is 79964468902.

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 20986446997 - 2³ = 20986446989 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 (20986446097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84853 + ... + 221749.

It is an arithmetic number, because the mean of its divisors is an integer number (2656368792).

Almost surely, 2^20986446997 is an apocalyptic number.

It is an amenable number.

20986446997 is a deficient number, since it is larger than the sum of its proper divisors (264503339).

20986446997 is a wasteful number, since it uses less digits than its factorization.

20986446997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138827.

The product of its (nonzero) digits is 47029248, while the sum is 64.

The spelling of 20986446997 in words is "twenty billion, nine hundred eighty-six million, four hundred forty-six thousand, nine hundred ninety-seven".