20685038210 has 16 divisors (see below), whose sum is σ = 37377949176. Its totient is φ = 8241819648.

The previous prime is 20685038159. The next prime is 20685038281. The reversal of 20685038210 is 1283058602.

It can be written as a sum of positive squares in 4 ways, for example, as 20460727681 + 224310529 = 143041^2 + 14977^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4021757 + ... + 4026896.

Almost surely, 2^20685038210 is an apocalyptic number.

20685038210 is a deficient number, since it is larger than the sum of its proper divisors (16692910966).

20685038210 is a wasteful number, since it uses less digits than its factorization.

20685038210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8048917.

The product of its (nonzero) digits is 23040, while the sum is 35.

The spelling of 20685038210 in words is "twenty billion, six hundred eighty-five million, thirty-eight thousand, two hundred ten".