20555972 has 12 divisors (see below), whose sum is σ = 36035580. Its totient is φ = 10260096.

The previous prime is 20555971. The next prime is 20555999. The reversal of 20555972 is 27955502.

It can be written as a sum of positive squares in 2 ways, for example, as 1406596 + 19149376 = 1186^2 + 4376^2 .

It is not an unprimeable number, because it can be changed into a prime (20555971) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1697 + ... + 6632.

It is an arithmetic number, because the mean of its divisors is an integer number (3002965).

Almost surely, 2^20555972 is an apocalyptic number.

It is an amenable number.

20555972 is a deficient number, since it is larger than the sum of its proper divisors (15479608).

20555972 is a wasteful number, since it uses less digits than its factorization.

20555972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8950 (or 8948 counting only the distinct ones).

The product of its (nonzero) digits is 31500, while the sum is 35.

The square root of 20555972 is about 4533.8694290859. The cubic root of 20555972 is about 273.9340420561.

The spelling of 20555972 in words is "twenty million, five hundred fifty-five thousand, nine hundred seventy-two".