20834172 has 30 divisors (see below), whose sum is σ = 54465488. Its totient is φ = 6944616.

The previous prime is 20834167. The next prime is 20834213. The reversal of 20834172 is 27143802.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 31828 + ... + 32475.

Almost surely, 2^20834172 is an apocalyptic number.

It is an amenable number.

20834172 is an abundant number, since it is smaller than the sum of its proper divisors (33631316).

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

20834172 is a wasteful number, since it uses less digits than its factorization.

20834172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64319 (or 64308 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 20834172 is about 4564.4465162821. The cubic root of 20834172 is about 275.1642963134.

Adding to 20834172 its reverse (27143802), we get a palindrome (47977974).

The spelling of 20834172 in words is "twenty million, eight hundred thirty-four thousand, one hundred seventy-two".