20673215 has 8 divisors (see below), whose sum is σ = 24920448. Its totient is φ = 16463520.

The previous prime is 20673209. The next prime is 20673217. The reversal of 20673215 is 51237602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20673215 - 2⁴ = 20673199 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20673217) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 8156 + ... + 10385.

It is an arithmetic number, because the mean of its divisors is an integer number (3115056).

Almost surely, 2^20673215 is an apocalyptic number.

20673215 is a deficient number, since it is larger than the sum of its proper divisors (4247233).

20673215 is a wasteful number, since it uses less digits than its factorization.

20673215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18769.

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

The square root of 20673215 is about 4546.7807292633. The cubic root of 20673215 is about 274.4538582456.

The spelling of 20673215 in words is "twenty million, six hundred seventy-three thousand, two hundred fifteen".