20556460 has 24 divisors (see below), whose sum is σ = 44336880. Its totient is φ = 8000064.

The previous prime is 20556433. The next prime is 20556467. The reversal of 20556460 is 6465502.

It is a plaindrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (20556467) by changing a digit.

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, 13150 + ... + 14629.

It is an arithmetic number, because the mean of its divisors is an integer number (1847370).

Almost surely, 2^20556460 is an apocalyptic number.

20556460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20556460 is an abundant number, since it is smaller than the sum of its proper divisors (23780420).

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

20556460 is a wasteful number, since it uses less digits than its factorization.

20556460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27825 (or 27823 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 20556460 is about 4533.9232459317. The cubic root of 20556460 is about 273.9362097758.

It can be divided in two parts, 2055 and 6460, that added together give a triangular number (8515 = T₁₃₀).

The spelling of 20556460 in words is "twenty million, five hundred fifty-six thousand, four hundred sixty".