20405685083 has 8 divisors (see below), whose sum is σ = 23324271360. Its totient is φ = 17487970920.

The previous prime is 20405684983. The next prime is 20405685103. The reversal of 20405685083 is 38058650402.

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

It is not a de Polignac number, because 20405685083 - 2¹⁰ = 20405684059 is a prime.

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 20405685083.

It is not an unprimeable number, because it can be changed into a prime (20405685283) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 167093 + ... + 262166.

It is an arithmetic number, because the mean of its divisors is an integer number (2915533920).

Almost surely, 2^20405685083 is an apocalyptic number.

20405685083 is a deficient number, since it is larger than the sum of its proper divisors (2918586277).

20405685083 is an equidigital number, since it uses as much as digits as its factorization.

20405685083 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 436057.

The product of its (nonzero) digits is 230400, while the sum is 41.

The spelling of 20405685083 in words is "twenty billion, four hundred five million, six hundred eighty-five thousand, eighty-three".