20672315 has 4 divisors (see below), whose sum is σ = 24806784. Its totient is φ = 16537848.

The previous prime is 20672299. The next prime is 20672321. The reversal of 20672315 is 51327602.

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

It is a cyclic number.

It is not a de Polignac number, because 20672315 - 2⁴ = 20672299 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2067227 + ... + 2067236.

It is an arithmetic number, because the mean of its divisors is an integer number (6201696).

Almost surely, 2^20672315 is an apocalyptic number.

20672315 is a deficient number, since it is larger than the sum of its proper divisors (4134469).

20672315 is an equidigital number, since it uses as much as digits as its factorization.

20672315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4134468.

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 20672315 is about 4546.6817570620. The cubic root of 20672315 is about 274.4498754422.

Adding to 20672315 its reverse (51327602), we get a palindrome (71999917).

The spelling of 20672315 in words is "twenty million, six hundred seventy-two thousand, three hundred fifteen".