20985800007 has 8 divisors (see below), whose sum is σ = 27986118784. Its totient is φ = 13988007288.

The previous prime is 20985799999. The next prime is 20985800009. The reversal of 20985800007 is 70000858902.

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

It is not a de Polignac number, because 20985800007 - 2³ = 20985799999 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 (20985800009) 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 7 ways as a sum of consecutive naturals, for example, 612043 + ... + 645420.

It is an arithmetic number, because the mean of its divisors is an integer number (3498264848).

Almost surely, 2^20985800007 is an apocalyptic number.

20985800007 is a deficient number, since it is larger than the sum of its proper divisors (7000318777).

20985800007 is a wasteful number, since it uses less digits than its factorization.

20985800007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1263029.

The product of its (nonzero) digits is 40320, while the sum is 39.

The spelling of 20985800007 in words is "twenty billion, nine hundred eighty-five million, eight hundred thousand, seven".