20555960 has 16 divisors (see below), whose sum is σ = 46251000. Its totient is φ = 8222368.

The previous prime is 20555957. The next prime is 20555971. The reversal of 20555960 is 6955502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 256910 + ... + 256989.

Almost surely, 2^20555960 is an apocalyptic number.

20555960 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20555960 is an abundant number, since it is smaller than the sum of its proper divisors (25695040).

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

20555960 is a wasteful number, since it uses less digits than its factorization.

20555960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 513910 (or 513906 counting only the distinct ones).

The product of its (nonzero) digits is 13500, while the sum is 32.

The square root of 20555960 is about 4533.8681057128. The cubic root of 20555960 is about 273.9339887511.

It can be divided in two parts, 205 and 55960, that added together give a palindrome (56165).

The spelling of 20555960 in words is "twenty million, five hundred fifty-five thousand, nine hundred sixty".