20328725 has 12 divisors (see below), whose sum is σ = 25890084. Its totient is φ = 15822720.

The previous prime is 20328713. The next prime is 20328767. The reversal of 20328725 is 52782302.

It can be written as a sum of positive squares in 6 ways, for example, as 96721 + 20232004 = 311^2 + 4498^2 .

It is not a de Polignac number, because 20328725 - 2¹⁶ = 20263189 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10064 + ... + 11913.

It is an arithmetic number, because the mean of its divisors is an integer number (2157507).

Almost surely, 2^20328725 is an apocalyptic number.

20328725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20328725 is a deficient number, since it is larger than the sum of its proper divisors (5561359).

20328725 is a wasteful number, since it uses less digits than its factorization.

20328725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22024 (or 22019 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 20328725 is about 4508.7387371636. The cubic root of 20328725 is about 272.9208490188.

The spelling of 20328725 in words is "twenty million, three hundred twenty-eight thousand, seven hundred twenty-five".