20460921 has 32 divisors (see below), whose sum is σ = 30912000. Its totient is φ = 11950848.

The previous prime is 20460917. The next prime is 20460931. The reversal of 20460921 is 12906402.

It is not a de Polignac number, because 20460921 - 2² = 20460917 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20460891 and 20460900.

It is not an unprimeable number, because it can be changed into a prime (20460931) 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 31 ways as a sum of consecutive naturals, for example, 89235 + ... + 89463.

It is an arithmetic number, because the mean of its divisors is an integer number (966000).

Almost surely, 2^20460921 is an apocalyptic number.

It is an amenable number.

20460921 is a deficient number, since it is larger than the sum of its proper divisors (10451079).

20460921 is a wasteful number, since it uses less digits than its factorization.

20460921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 353.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 20460921 is about 4523.3749568215. The cubic root of 20460921 is about 273.5111650951.

The spelling of 20460921 in words is "twenty million, four hundred sixty thousand, nine hundred twenty-one".