20380172 has 12 divisors (see below), whose sum is σ = 35697480. Its totient is φ = 10180896.

The previous prime is 20380169. The next prime is 20380177. The reversal of 20380172 is 27108302.

It is not an unprimeable number, because it can be changed into a prime (20380177) 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, 6104 + ... + 8832.

It is an arithmetic number, because the mean of its divisors is an integer number (2974790).

Almost surely, 2^20380172 is an apocalyptic number.

It is an amenable number.

20380172 is a deficient number, since it is larger than the sum of its proper divisors (15317308).

20380172 is a wasteful number, since it uses less digits than its factorization.

20380172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4600 (or 4598 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 20380172 is about 4514.4403861387. The cubic root of 20380172 is about 273.1508869054.

Adding to 20380172 its reverse (27108302), we get a palindrome (47488474).

The spelling of 20380172 in words is "twenty million, three hundred eighty thousand, one hundred seventy-two".