20310551405 has 4 divisors (see below), whose sum is σ = 24372661692. Its totient is φ = 16248441120.

The previous prime is 20310551383. The next prime is 20310551407. The reversal of 20310551405 is 50415501302.

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 15837215716 + 4473335689 = 125846^2 + 66883^2 .

It is a de Polignac number, because none of the positive numbers 2^k-20310551405 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20310551407) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2031055136 + ... + 2031055145.

It is an arithmetic number, because the mean of its divisors is an integer number (6093165423).

Almost surely, 2^20310551405 is an apocalyptic number.

It is an amenable number.

20310551405 is a deficient number, since it is larger than the sum of its proper divisors (4062110287).

20310551405 is an equidigital number, since it uses as much as digits as its factorization.

20310551405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4062110286.

The product of its (nonzero) digits is 3000, while the sum is 26.

The spelling of 20310551405 in words is "twenty billion, three hundred ten million, five hundred fifty-one thousand, four hundred five".