20147871745 has 4 divisors (see below), whose sum is σ = 24177446100. Its totient is φ = 16118297392.

The previous prime is 20147871673. The next prime is 20147871749. The reversal of 20147871745 is 54717874102.

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 14940661824 + 5207209921 = 122232^2 + 72161^2 .

It is a cyclic number.

It is not a de Polignac number, because 20147871745 - 2¹³ = 20147863553 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20147871695 and 20147871704.

It is not an unprimeable number, because it can be changed into a prime (20147871749) 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, 2014787170 + ... + 2014787179.

It is an arithmetic number, because the mean of its divisors is an integer number (6044361525).

Almost surely, 2^20147871745 is an apocalyptic number.

It is an amenable number.

20147871745 is a deficient number, since it is larger than the sum of its proper divisors (4029574355).

20147871745 is an equidigital number, since it uses as much as digits as its factorization.

20147871745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4029574354.

The product of its (nonzero) digits is 439040, while the sum is 46.

The spelling of 20147871745 in words is "twenty billion, one hundred forty-seven million, eight hundred seventy-one thousand, seven hundred forty-five".