20470169477 has 4 divisors (see below), whose sum is σ = 21176037420. Its totient is φ = 19764301536.

The previous prime is 20470169417. The next prime is 20470169497. The reversal of 20470169477 is 77496107402.

It is a happy number.

It is a Cunningham number, because it is equal to 143074²+1.

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 10734203236 + 9735966241 = 103606^2 + 98671^2 .

It is a cyclic number.

It is not a de Polignac number, because 20470169477 - 2²⁰ = 20469120901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20470169407) 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, 352933928 + ... + 352933985.

It is an arithmetic number, because the mean of its divisors is an integer number (5294009355).

Almost surely, 2^20470169477 is an apocalyptic number.

It is an amenable number.

20470169477 is a deficient number, since it is larger than the sum of its proper divisors (705867943).

20470169477 is an equidigital number, since it uses as much as digits as its factorization.

20470169477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 705867942.

The product of its (nonzero) digits is 592704, while the sum is 47.

The spelling of 20470169477 in words is "twenty billion, four hundred seventy million, one hundred sixty-nine thousand, four hundred seventy-seven".