20172943 has 8 divisors (see below), whose sum is σ = 23617440. Its totient is φ = 16869120.

The previous prime is 20172941. The next prime is 20172949. The reversal of 20172943 is 34927102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20172943 - 2¹ = 20172941 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20172941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34858 + ... + 35431.

It is an arithmetic number, because the mean of its divisors is an integer number (2952180).

Almost surely, 2^20172943 is an apocalyptic number.

20172943 is a deficient number, since it is larger than the sum of its proper divisors (3444497).

20172943 is an equidigital number, since it uses as much as digits as its factorization.

20172943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70337.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 20172943 is about 4491.4299504723. The cubic root of 20172943 is about 272.2219164666.

It can be divided in two parts, 20172 and 943, that added together give a triangular number (21115 = T₂₀₅).

The spelling of 20172943 in words is "twenty million, one hundred seventy-two thousand, nine hundred forty-three".