20650172 has 12 divisors (see below), whose sum is σ = 38263680. Its totient is φ = 9717696.

The previous prime is 20650171. The next prime is 20650187. The reversal of 20650172 is 27105602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20650171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 151772 + ... + 151907.

It is an arithmetic number, because the mean of its divisors is an integer number (3188640).

Almost surely, 2^20650172 is an apocalyptic number.

It is an amenable number.

20650172 is a deficient number, since it is larger than the sum of its proper divisors (17613508).

20650172 is a wasteful number, since it uses less digits than its factorization.

20650172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303700 (or 303698 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 20650172 is about 4544.2460320718. The cubic root of 20650172 is about 274.3518487704.

Adding to 20650172 its reverse (27105602), we get a palindrome (47755774).

The spelling of 20650172 in words is "twenty million, six hundred fifty thousand, one hundred seventy-two".