20517772473 has 40 divisors (see below), whose sum is σ = 33454312320. Its totient is φ = 12428341920.

The previous prime is 20517772469. The next prime is 20517772477. The reversal of 20517772473 is 37427771502.

20517772473 is a `hidden beast` number, since 2 + 0 + 5 + 177 + 7 + 2 + 473 = 666.

It is an interprime number because it is at equal distance from previous prime (20517772469) and next prime (20517772477).

It is not a de Polignac number, because 20517772473 - 2² = 20517772469 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20517772477) 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 39 ways as a sum of consecutive naturals, for example, 2032683 + ... + 2042751.

It is an arithmetic number, because the mean of its divisors is an integer number (836357808).

Almost surely, 2^20517772473 is an apocalyptic number.

It is an amenable number.

20517772473 is a deficient number, since it is larger than the sum of its proper divisors (12936539847).

20517772473 is a wasteful number, since it uses less digits than its factorization.

20517772473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12379 (or 12370 counting only the distinct ones).

The product of its (nonzero) digits is 576240, while the sum is 45.

The spelling of 20517772473 in words is "twenty billion, five hundred seventeen million, seven hundred seventy-two thousand, four hundred seventy-three".