20500173475 has 12 divisors (see below), whose sum is σ = 25422641944. Its totient is φ = 16398573120.

The previous prime is 20500173461. The next prime is 20500173497. The reversal of 20500173475 is 57437100502.

It is not a de Polignac number, because 20500173475 - 2¹⁷ = 20500042403 is a prime.

It is a super-4 number, since 4×20500173475⁴ (a number of 42 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20500173475.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 278512 + ... + 344338.

Almost surely, 2^20500173475 is an apocalyptic number.

20500173475 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20500173475 is a deficient number, since it is larger than the sum of its proper divisors (4922468469).

20500173475 is a wasteful number, since it uses less digits than its factorization.

20500173475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78294 (or 78289 counting only the distinct ones).

The product of its (nonzero) digits is 29400, while the sum is 34.

Adding to 20500173475 its reverse (57437100502), we get a palindrome (77937273977).

The spelling of 20500173475 in words is "twenty billion, five hundred million, one hundred seventy-three thousand, four hundred seventy-five".