20400571975 has 48 divisors (see below), whose sum is σ = 29441671168. Its totient is φ = 13734282240.

The previous prime is 20400571937. The next prime is 20400571979. The reversal of 20400571975 is 57917500402.

It is not a de Polignac number, because 20400571975 - 2¹¹ = 20400569927 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20400571979) 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 47 ways as a sum of consecutive naturals, for example, 2151094 + ... + 2160556.

Almost surely, 2^20400571975 is an apocalyptic number.

20400571975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20400571975 is a deficient number, since it is larger than the sum of its proper divisors (9041099193).

20400571975 is a wasteful number, since it uses less digits than its factorization.

20400571975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9704 (or 9699 counting only the distinct ones).

The product of its (nonzero) digits is 88200, while the sum is 40.

The spelling of 20400571975 in words is "twenty billion, four hundred million, five hundred seventy-one thousand, nine hundred seventy-five".