20488745605 has 4 divisors (see below), whose sum is σ = 24586494732. Its totient is φ = 16390996480.

The previous prime is 20488745573. The next prime is 20488745617. The reversal of 20488745605 is 50654788402.

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 4120869636 + 16367875969 = 64194^2 + 127937^2 .

It is not a de Polignac number, because 20488745605 - 2⁵ = 20488745573 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2048874556 + ... + 2048874565.

It is an arithmetic number, because the mean of its divisors is an integer number (6146623683).

Almost surely, 2^20488745605 is an apocalyptic number.

It is an amenable number.

20488745605 is a deficient number, since it is larger than the sum of its proper divisors (4097749127).

20488745605 is an equidigital number, since it uses as much as digits as its factorization.

20488745605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4097749126.

The product of its (nonzero) digits is 2150400, while the sum is 49.

The spelling of 20488745605 in words is "twenty billion, four hundred eighty-eight million, seven hundred forty-five thousand, six hundred five".