20476312457 has 4 divisors (see below), whose sum is σ = 20764711296. Its totient is φ = 20187913620.

The previous prime is 20476312411. The next prime is 20476312477. The reversal of 20476312457 is 75421367402.

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, and also an emirpimes, since its reverse is a distinct semiprime: 75421367402 = 2 ⋅37710683701.

It is a cyclic number.

It is not a de Polignac number, because 20476312457 - 2¹² = 20476308361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20476312477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 144199313 + ... + 144199454.

It is an arithmetic number, because the mean of its divisors is an integer number (5191177824).

Almost surely, 2^20476312457 is an apocalyptic number.

It is an amenable number.

20476312457 is a deficient number, since it is larger than the sum of its proper divisors (288398839).

20476312457 is an equidigital number, since it uses as much as digits as its factorization.

20476312457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288398838.

The product of its (nonzero) digits is 282240, while the sum is 41.

Adding to 20476312457 its reverse (75421367402), we get a palindrome (95897679859).

Subtracting 20476312457 from its reverse (75421367402), we obtain a palindrome (54945054945).

The spelling of 20476312457 in words is "twenty billion, four hundred seventy-six million, three hundred twelve thousand, four hundred fifty-seven".