20555025 has 24 divisors (see below), whose sum is σ = 34164480. Its totient is φ = 10904640.

The previous prime is 20555009. The next prime is 20555071. The reversal of 20555025 is 52055502.

It is not a de Polignac number, because 20555025 - 2⁴ = 20555009 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20554986 and 20555004.

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 23 ways as a sum of consecutive naturals, for example, 16111 + ... + 17339.

It is an arithmetic number, because the mean of its divisors is an integer number (1423520).

Almost surely, 2^20555025 is an apocalyptic number.

20555025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20555025 is a deficient number, since it is larger than the sum of its proper divisors (13609455).

20555025 is a wasteful number, since it uses less digits than its factorization.

20555025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1465 (or 1460 counting only the distinct ones).

The product of its (nonzero) digits is 2500, while the sum is 24.

The square root of 20555025 is about 4533.7649917039. The cubic root of 20555025 is about 273.9298353383.

The spelling of 20555025 in words is "twenty million, five hundred fifty-five thousand, twenty-five".