20472316769 has 2 divisors, whose sum is σ = 20472316770. Its totient is φ = 20472316768.

The previous prime is 20472316699. The next prime is 20472316817. The reversal of 20472316769 is 96761327402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18465276769 + 2007040000 = 135887^2 + 44800^2 .

It is a cyclic number.

It is not a de Polignac number, because 20472316769 - 2²⁰ = 20471268193 is a prime.

It is a super-2 number, since 2×20472316769² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (20472316069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10236158384 + 10236158385.

It is an arithmetic number, because the mean of its divisors is an integer number (10236158385).

Almost surely, 2^20472316769 is an apocalyptic number.

It is an amenable number.

20472316769 is a deficient number, since it is larger than the sum of its proper divisors (1).

20472316769 is an equidigital number, since it uses as much as digits as its factorization.

20472316769 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 762048, while the sum is 47.

The spelling of 20472316769 in words is "twenty billion, four hundred seventy-two million, three hundred sixteen thousand, seven hundred sixty-nine".