20172346 has 4 divisors (see below), whose sum is σ = 30258522. Its totient is φ = 10086172.

The previous prime is 20172343. The next prime is 20172349. The reversal of 20172346 is 64327102.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (20172343) and next prime (20172349).

It can be written as a sum of positive squares in only one way, i.e., 20115225 + 57121 = 4485^2 + 239^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20172346.

It is not an unprimeable number, because it can be changed into a prime (20172343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5043085 + ... + 5043088.

Almost surely, 2^20172346 is an apocalyptic number.

20172346 is a deficient number, since it is larger than the sum of its proper divisors (10086176).

20172346 is a wasteful number, since it uses less digits than its factorization.

20172346 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10086175.

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 20172346 is about 4491.3634900774. The cubic root of 20172346 is about 272.2192310529.

Adding to 20172346 its reverse (64327102), we get a palindrome (84499448).

The spelling of 20172346 in words is "twenty million, one hundred seventy-two thousand, three hundred forty-six".