20172355132 has 6 divisors (see below), whose sum is σ = 35301621488. Its totient is φ = 10086177564.

The previous prime is 20172355117. The next prime is 20172355139. The reversal of 20172355132 is 23155327102.

It is a junction number, because it is equal to n+sod(n) for n = 20172355094 and 20172355103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20172355139) 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 as a sum of consecutive naturals, namely, 2521544388 + ... + 2521544395.

Almost surely, 2^20172355132 is an apocalyptic number.

It is an amenable number.

20172355132 is a deficient number, since it is larger than the sum of its proper divisors (15129266356).

20172355132 is a wasteful number, since it uses less digits than its factorization.

20172355132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5043088787 (or 5043088785 counting only the distinct ones).

The product of its (nonzero) digits is 12600, while the sum is 31.

The spelling of 20172355132 in words is "twenty billion, one hundred seventy-two million, three hundred fifty-five thousand, one hundred thirty-two".