20985004351 has 8 divisors (see below), whose sum is σ = 21480827984. Its totient is φ = 20489535360.

The previous prime is 20985004321. The next prime is 20985004379. The reversal of 20985004351 is 15340058902.

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 20985004351 - 2⁷ = 20985004223 is a prime.

It is a super-2 number, since 2×20985004351² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20985004351.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20985004321) 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, 33031 + ... + 207511.

It is an arithmetic number, because the mean of its divisors is an integer number (2685103498).

Almost surely, 2^20985004351 is an apocalyptic number.

20985004351 is a deficient number, since it is larger than the sum of its proper divisors (495823633).

20985004351 is a wasteful number, since it uses less digits than its factorization.

20985004351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177321.

The product of its (nonzero) digits is 43200, while the sum is 37.

The spelling of 20985004351 in words is "twenty billion, nine hundred eighty-five million, four thousand, three hundred fifty-one".