20172942 has 32 divisors (see below), whose sum is σ = 45100800. Its totient is φ = 6683544.

The previous prime is 20172941. The next prime is 20172949. The reversal of 20172942 is 24927102.

It is a Harshad number since it is a multiple of its sum of digits (27).

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 polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8623 + ... + 10709.

It is an arithmetic number, because the mean of its divisors is an integer number (1409400).

Almost surely, 2^20172942 is an apocalyptic number.

20172942 is an abundant number, since it is smaller than the sum of its proper divisors (24927858).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20172942 is a wasteful number, since it uses less digits than its factorization.

20172942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2277 (or 2271 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 20172942 is about 4491.4298391492. The cubic root of 20172942 is about 272.2219119684.

The spelling of 20172942 in words is "twenty million, one hundred seventy-two thousand, nine hundred forty-two".