20654172 has 72 divisors (see below), whose sum is σ = 65100672. Its totient is φ = 5364000.

The previous prime is 20654171. The next prime is 20654191. The reversal of 20654172 is 27145602.

20654172 is a `hidden beast` number, since 2 + 0 + 654 + 1 + 7 + 2 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20654171) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 954 + ... + 6497.

It is an arithmetic number, because the mean of its divisors is an integer number (904176).

Almost surely, 2^20654172 is an apocalyptic number.

20654172 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20654172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32550336).

20654172 is an abundant number, since it is smaller than the sum of its proper divisors (44446500).

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

20654172 is a wasteful number, since it uses less digits than its factorization.

20654172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7479 (or 7474 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 20654172 is about 4544.6861277760. The cubic root of 20654172 is about 274.3695618843.

Adding to 20654172 its reverse (27145602), we get a palindrome (47799774).

The spelling of 20654172 in words is "twenty million, six hundred fifty-four thousand, one hundred seventy-two".