20538266 has 16 divisors (see below), whose sum is σ = 35268480. Its totient is φ = 8787120.

The previous prime is 20538239. The next prime is 20538283. The reversal of 20538266 is 66283502.

It is a Curzon 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 7 ways as a sum of consecutive naturals, for example, 12395 + ... + 13953.

It is an arithmetic number, because the mean of its divisors is an integer number (2204280).

Almost surely, 2^20538266 is an apocalyptic number.

20538266 is a deficient number, since it is larger than the sum of its proper divisors (14730214).

20538266 is a wasteful number, since it uses less digits than its factorization.

20538266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2509.

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 20538266 is about 4531.9163716909. The cubic root of 20538266 is about 273.8553679297.

The spelling of 20538266 in words is "twenty million, five hundred thirty-eight thousand, two hundred sixty-six".