20726172 has 48 divisors (see below), whose sum is σ = 54996480. Its totient is φ = 6746544.

The previous prime is 20726171. The next prime is 20726177. The reversal of 20726172 is 27162702.

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 (20726171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2413 + ... + 6875.

It is an arithmetic number, because the mean of its divisors is an integer number (1145760).

Almost surely, 2^20726172 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 20726172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27498240).

20726172 is an abundant number, since it is smaller than the sum of its proper divisors (34270308).

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

20726172 is a wasteful number, since it uses less digits than its factorization.

20726172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4519 (or 4511 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 27.

The square root of 20726172 is about 4552.6005754953. The cubic root of 20726172 is about 274.6880076054.

Adding to 20726172 its reverse (27162702), we get a palindrome (47888874).

The spelling of 20726172 in words is "twenty million, seven hundred twenty-six thousand, one hundred seventy-two".