20930172 has 48 divisors (see below), whose sum is σ = 52684800. Its totient is φ = 6445440.

The previous prime is 20930171. The next prime is 20930183. The reversal of 20930172 is 27103902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20930171) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 8229 + ... + 10467.

It is an arithmetic number, because the mean of its divisors is an integer number (1097600).

Almost surely, 2^20930172 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20930172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26342400).

20930172 is an abundant number, since it is smaller than the sum of its proper divisors (31754628).

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

20930172 is a wasteful number, since it uses less digits than its factorization.

20930172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2306 (or 2304 counting only the distinct ones).

The product of its (nonzero) digits is 756, while the sum is 24.

The square root of 20930172 is about 4574.9504915354. The cubic root of 20930172 is about 275.5862841739.

It can be divided in two parts, 209 and 30172, that added together give a triangular number (30381 = T₂₄₆).

The spelling of 20930172 in words is "twenty million, nine hundred thirty thousand, one hundred seventy-two".