20525109 has 12 divisors (see below), whose sum is σ = 30081408. Its totient is φ = 12439240.

The previous prime is 20525101. The next prime is 20525129. The reversal of 20525109 is 90152502.

It is not a de Polignac number, because 20525109 - 2³ = 20525101 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20525101) by changing a digit.

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, 27909 + ... + 28634.

It is an arithmetic number, because the mean of its divisors is an integer number (2506784).

Almost surely, 2^20525109 is an apocalyptic number.

It is an amenable number.

20525109 is a deficient number, since it is larger than the sum of its proper divisors (9556299).

20525109 is a wasteful number, since it uses less digits than its factorization.

20525109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56568 (or 56557 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 24.

The square root of 20525109 is about 4530.4645457171. The cubic root of 20525109 is about 273.7968773582.

The spelling of 20525109 in words is "twenty million, five hundred twenty-five thousand, one hundred nine".