20310253405 has 16 divisors (see below), whose sum is σ = 26269420464. Its totient is φ = 14985584640.

The previous prime is 20310253393. The next prime is 20310253423. The reversal of 20310253405 is 50435201302.

It can be written as a sum of positive squares in 8 ways, for example, as 2764866724 + 17545386681 = 52582^2 + 132459^2 .

It is not a de Polignac number, because 20310253405 - 2¹⁹ = 20309729117 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 20310253405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55524 + ... + 209053.

It is an arithmetic number, because the mean of its divisors is an integer number (1641838779).

Almost surely, 2^20310253405 is an apocalyptic number.

It is an amenable number.

20310253405 is a deficient number, since it is larger than the sum of its proper divisors (5959167059).

20310253405 is a wasteful number, since it uses less digits than its factorization.

20310253405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265776.

The product of its (nonzero) digits is 3600, while the sum is 25.

Adding to 20310253405 its reverse (50435201302), we get a palindrome (70745454707).

The spelling of 20310253405 in words is "twenty billion, three hundred ten million, two hundred fifty-three thousand, four hundred five".