20620021405 has 4 divisors (see below), whose sum is σ = 24744025692. Its totient is φ = 16496017120.

The previous prime is 20620021397. The next prime is 20620021421. The reversal of 20620021405 is 50412002602.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6577534404 + 14042487001 = 81102^2 + 118501^2 .

It is not a de Polignac number, because 20620021405 - 2³ = 20620021397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 2062002136 + ... + 2062002145.

It is an arithmetic number, because the mean of its divisors is an integer number (6186006423).

Almost surely, 2^20620021405 is an apocalyptic number.

It is an amenable number.

20620021405 is a deficient number, since it is larger than the sum of its proper divisors (4124004287).

20620021405 is an equidigital number, since it uses as much as digits as its factorization.

20620021405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4124004286.

The product of its (nonzero) digits is 960, while the sum is 22.

The spelling of 20620021405 in words is "twenty billion, six hundred twenty million, twenty-one thousand, four hundred five".