20673913 has 8 divisors (see below), whose sum is σ = 22333248. Its totient is φ = 19024464.

The previous prime is 20673907. The next prime is 20673943. The reversal of 20673913 is 31937602.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20673913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20673943) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2220 + ... + 6802.

It is an arithmetic number, because the mean of its divisors is an integer number (2791656).

Almost surely, 2^20673913 is an apocalyptic number.

It is an amenable number.

20673913 is a deficient number, since it is larger than the sum of its proper divisors (1659335).

20673913 is a wasteful number, since it uses less digits than its factorization.

20673913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4943.

The product of its (nonzero) digits is 6804, while the sum is 31.

The square root of 20673913 is about 4546.8574862206. The cubic root of 20673913 is about 274.4569470514.

The spelling of 20673913 in words is "twenty million, six hundred seventy-three thousand, nine hundred thirteen".