20525155 has 8 divisors (see below), whose sum is σ = 28148832. Its totient is φ = 14074368.

The previous prime is 20525129. The next prime is 20525159. The reversal of 20525155 is 55152502.

It is a happy number.

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

It is not a de Polignac number, because 20525155 - 2¹⁵ = 20492387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20525159) 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 7 ways as a sum of consecutive naturals, for example, 293182 + ... + 293251.

It is an arithmetic number, because the mean of its divisors is an integer number (3518604).

Almost surely, 2^20525155 is an apocalyptic number.

20525155 is a deficient number, since it is larger than the sum of its proper divisors (7623677).

20525155 is an equidigital number, since it uses as much as digits as its factorization.

20525155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 586445.

The product of its (nonzero) digits is 2500, while the sum is 25.

The square root of 20525155 is about 4530.4696224564. The cubic root of 20525155 is about 273.7970818987.

Adding to 20525155 its reverse (55152502), we get a palindrome (75677657).

The spelling of 20525155 in words is "twenty million, five hundred twenty-five thousand, one hundred fifty-five".