20565050 has 48 divisors (see below), whose sum is σ = 42184800. Its totient is φ = 7396800.

The previous prime is 20565001. The next prime is 20565073. The reversal of 20565050 is 5056502.

20565050 = T₂₄₁ + T₂₄₂ + ... + T₅₁₅.

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 23 ways as a sum of consecutive naturals, for example, 76316 + ... + 76584.

It is an arithmetic number, because the mean of its divisors is an integer number (878850).

Almost surely, 2^20565050 is an apocalyptic number.

20565050 is an abundant number, since it is smaller than the sum of its proper divisors (21619750).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20565050 is a wasteful number, since it uses less digits than its factorization.

20565050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431 (or 426 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 23.

The square root of 20565050 is about 4534.8704501893. The cubic root of 20565050 is about 273.9743613569.

The spelling of 20565050 in words is "twenty million, five hundred sixty-five thousand, fifty".