20605525 has 12 divisors (see below), whose sum is σ = 25792992. Its totient is φ = 16328240.

The previous prime is 20605477. The next prime is 20605531. The reversal of 20605525 is 52550602.

It is not a de Polignac number, because 20605525 - 2⁷ = 20605397 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a self number, because there is not a number n which added to its sum of digits gives 20605525.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 1177 + ... + 6526.

It is an arithmetic number, because the mean of its divisors is an integer number (2149416).

Almost surely, 2^20605525 is an apocalyptic number.

20605525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20605525 is a deficient number, since it is larger than the sum of its proper divisors (5187467).

20605525 is a wasteful number, since it uses less digits than its factorization.

20605525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7820 (or 7815 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 20605525 is about 4539.3308978306. The cubic root of 20605525 is about 274.1539839889.

The spelling of 20605525 in words is "twenty million, six hundred five thousand, five hundred twenty-five".