20540556 has 36 divisors (see below), whose sum is σ = 54977832. Its totient is φ = 6443904.

The previous prime is 20540543. The next prime is 20540557. The reversal of 20540556 is 65504502.

20540556 is a `hidden beast` number, since 205 + 405 + 56 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (20540557) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16170 + ... + 17393.

It is an arithmetic number, because the mean of its divisors is an integer number (1527162).

Almost surely, 2^20540556 is an apocalyptic number.

It is an amenable number.

20540556 is an abundant number, since it is smaller than the sum of its proper divisors (34437276).

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

20540556 is a wasteful number, since it uses less digits than its factorization.

20540556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33590 (or 33585 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 27.

The square root of 20540556 is about 4532.1690171484. The cubic root of 20540556 is about 273.8655457686.

The spelling of 20540556 in words is "twenty million, five hundred forty thousand, five hundred fifty-six".