20216002805 has 8 divisors (see below), whose sum is σ = 25095727800. Its totient is φ = 15615119296.

The previous prime is 20216002769. The next prime is 20216002819. The reversal of 20216002805 is 50820061202.

It can be written as a sum of positive squares in 4 ways, for example, as 6040242961 + 14175759844 = 77719^2 + 119062^2 .

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 20216002805 - 2¹² = 20215998709 is a prime.

It is a congruent number.

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, 69710210 + ... + 69710499.

It is an arithmetic number, because the mean of its divisors is an integer number (3136965975).

Almost surely, 2^20216002805 is an apocalyptic number.

It is an amenable number.

20216002805 is a deficient number, since it is larger than the sum of its proper divisors (4879724995).

20216002805 is a wasteful number, since it uses less digits than its factorization.

20216002805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139420743.

The product of its (nonzero) digits is 1920, while the sum is 26.

The spelling of 20216002805 in words is "twenty billion, two hundred sixteen million, two thousand, eight hundred five".