20474356165 has 4 divisors (see below), whose sum is σ = 24569227404. Its totient is φ = 16379484928.

The previous prime is 20474356159. The next prime is 20474356183. The reversal of 20474356165 is 56165347402.

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 4301129889 + 16173226276 = 65583^2 + 127174^2 .

It is a cyclic number.

It is not a de Polignac number, because 20474356165 - 2⁹ = 20474355653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2047435612 + ... + 2047435621.

It is an arithmetic number, because the mean of its divisors is an integer number (6142306851).

Almost surely, 2^20474356165 is an apocalyptic number.

It is an amenable number.

20474356165 is a deficient number, since it is larger than the sum of its proper divisors (4094871239).

20474356165 is an equidigital number, since it uses as much as digits as its factorization.

20474356165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4094871238.

The product of its (nonzero) digits is 604800, while the sum is 43.

The spelling of 20474356165 in words is "twenty billion, four hundred seventy-four million, three hundred fifty-six thousand, one hundred sixty-five".