20881525 has 24 divisors (see below), whose sum is σ = 31337280. Its totient is φ = 13474560.

The previous prime is 20881501. The next prime is 20881529. The reversal of 20881525 is 52518802.

It is not a de Polignac number, because 20881525 - 2¹¹ = 20879477 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20881529) 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 23 ways as a sum of consecutive naturals, for example, 535 + ... + 6484.

It is an arithmetic number, because the mean of its divisors is an integer number (1305720).

Almost surely, 2^20881525 is an apocalyptic number.

20881525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20881525 is a deficient number, since it is larger than the sum of its proper divisors (10455755).

20881525 is a wasteful number, since it uses less digits than its factorization.

20881525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7053 (or 7048 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 31.

The square root of 20881525 is about 4569.6307290633. The cubic root of 20881525 is about 275.3726078592.

The spelling of 20881525 in words is "twenty million, eight hundred eighty-one thousand, five hundred twenty-five".