20673355 has 4 divisors (see below), whose sum is σ = 24808032. Its totient is φ = 16538680.

The previous prime is 20673347. The next prime is 20673361. The reversal of 20673355 is 55337602.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55337602 = 2 ⋅27668801.

It is not a de Polignac number, because 20673355 - 2³ = 20673347 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2067331 + ... + 2067340.

It is an arithmetic number, because the mean of its divisors is an integer number (6202008).

Almost surely, 2^20673355 is an apocalyptic number.

20673355 is a deficient number, since it is larger than the sum of its proper divisors (4134677).

20673355 is an equidigital number, since it uses as much as digits as its factorization.

20673355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4134676.

The product of its (nonzero) digits is 18900, while the sum is 31.

The square root of 20673355 is about 4546.7961247454. The cubic root of 20673355 is about 274.4544777824.

The spelling of 20673355 in words is "twenty million, six hundred seventy-three thousand, three hundred fifty-five".