20315335457 has 4 divisors (see below), whose sum is σ = 20406435840. Its totient is φ = 20224235076.

The previous prime is 20315335451. The next prime is 20315335499. The reversal of 20315335457 is 75453351302.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20315335457 - 2⁴ = 20315335441 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 20315335457.

It is not an unprimeable number, because it can be changed into a prime (20315335451) 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, 45549857 + ... + 45550302.

It is an arithmetic number, because the mean of its divisors is an integer number (5101608960).

Almost surely, 2^20315335457 is an apocalyptic number.

It is an amenable number.

20315335457 is a deficient number, since it is larger than the sum of its proper divisors (91100383).

20315335457 is an equidigital number, since it uses as much as digits as its factorization.

20315335457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91100382.

The product of its (nonzero) digits is 189000, while the sum is 38.

Adding to 20315335457 its reverse (75453351302), we get a palindrome (95768686759).

The spelling of 20315335457 in words is "twenty billion, three hundred fifteen million, three hundred thirty-five thousand, four hundred fifty-seven".