20859081610 has 8 divisors (see below), whose sum is σ = 37546346916. Its totient is φ = 8343632640.

The previous prime is 20859081601. The next prime is 20859081613. The reversal of 20859081610 is 1618095802.

It can be written as a sum of positive squares in 2 ways, for example, as 20857425241 + 1656369 = 144421^2 + 1287^2 .

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

It is a super-2 number, since 2×20859081610² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20859081613) 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 3 ways as a sum of consecutive naturals, for example, 1042954071 + ... + 1042954090.

Almost surely, 2^20859081610 is an apocalyptic number.

20859081610 is a deficient number, since it is larger than the sum of its proper divisors (16687265306).

20859081610 is a wasteful number, since it uses less digits than its factorization.

20859081610 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2085908168.

The product of its (nonzero) digits is 34560, while the sum is 40.

The spelling of 20859081610 in words is "twenty billion, eight hundred fifty-nine million, eighty-one thousand, six hundred ten".