20925801 has 12 divisors (see below), whose sum is σ = 32551428. Its totient is φ = 12877344.

The previous prime is 20925799. The next prime is 20925811. The reversal of 20925801 is 10852902.

It can be written as a sum of positive squares in 2 ways, for example, as 7420176 + 13505625 = 2724^2 + 3675^2 .

It is not a de Polignac number, because 20925801 - 2¹ = 20925799 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20925811) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 89310 + ... + 89543.

It is an arithmetic number, because the mean of its divisors is an integer number (2712619).

Almost surely, 2^20925801 is an apocalyptic number.

It is an amenable number.

20925801 is a deficient number, since it is larger than the sum of its proper divisors (11625627).

20925801 is a wasteful number, since it uses less digits than its factorization.

20925801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178872 (or 178869 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 20925801 is about 4574.4727565043. The cubic root of 20925801 is about 275.5670986091.

The spelling of 20925801 in words is "twenty million, nine hundred twenty-five thousand, eight hundred one".