20925121 has 8 divisors (see below), whose sum is σ = 23946624. Its totient is φ = 17911680.

The previous prime is 20925119. The next prime is 20925139. The reversal of 20925121 is 12152902.

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

It is a cyclic number.

It is not a de Polignac number, because 20925121 - 2¹ = 20925119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20925092 and 20925101.

It is not an unprimeable number, because it can be changed into a prime (20923121) 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 7 ways as a sum of consecutive naturals, for example, 5361 + ... + 8401.

It is an arithmetic number, because the mean of its divisors is an integer number (2993328).

Almost surely, 2^20925121 is an apocalyptic number.

It is an amenable number.

20925121 is a deficient number, since it is larger than the sum of its proper divisors (3021503).

20925121 is an equidigital number, since it uses as much as digits as its factorization.

20925121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4031.

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 20925121 is about 4574.3984303950. The cubic root of 20925121 is about 275.5641136551.

The spelling of 20925121 in words is "twenty million, nine hundred twenty-five thousand, one hundred twenty-one".