20392421171 has 4 divisors (see below), whose sum is σ = 20395518000. Its totient is φ = 20389324344.

The previous prime is 20392421047. The next prime is 20392421201. The reversal of 20392421171 is 17112429302.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17112429302 = 2 ⋅8556214651.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20392421171 is a prime.

It is a super-2 number, since 2×20392421171² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20392421471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1538516 + ... + 1551713.

It is an arithmetic number, because the mean of its divisors is an integer number (5098879500).

Almost surely, 2^20392421171 is an apocalyptic number.

20392421171 is a deficient number, since it is larger than the sum of its proper divisors (3096829).

20392421171 is an equidigital number, since it uses as much as digits as its factorization.

20392421171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3096828.

The product of its (nonzero) digits is 6048, while the sum is 32.

The spelling of 20392421171 in words is "twenty billion, three hundred ninety-two million, four hundred twenty-one thousand, one hundred seventy-one".