20673121 has 16 divisors (see below), whose sum is σ = 25548160. Its totient is φ = 16329600.

The previous prime is 20673101. The next prime is 20673131. The reversal of 20673121 is 12137602.

It is not a de Polignac number, because 20673121 - 2⁹ = 20672609 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20673092 and 20673101.

It is not an unprimeable number, because it can be changed into a prime (20673101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2821 + ... + 7021.

It is an arithmetic number, because the mean of its divisors is an integer number (1596760).

Almost surely, 2^20673121 is an apocalyptic number.

It is an amenable number.

20673121 is a deficient number, since it is larger than the sum of its proper divisors (4875039).

20673121 is a wasteful number, since it uses less digits than its factorization.

20673121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4264.

The product of its (nonzero) digits is 504, while the sum is 22.

The square root of 20673121 is about 4546.7703922675. The cubic root of 20673121 is about 274.4534422693.

The spelling of 20673121 in words is "twenty million, six hundred seventy-three thousand, one hundred twenty-one".