20555255 has 24 divisors (see below), whose sum is σ = 29253312. Its totient is φ = 13820352.

The previous prime is 20555251. The next prime is 20555299. The reversal of 20555255 is 55255502.

It is a happy number.

It is not a de Polignac number, because 20555255 - 2² = 20555251 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20555251) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12194 + ... + 13776.

It is an arithmetic number, because the mean of its divisors is an integer number (1218888).

Almost surely, 2^20555255 is an apocalyptic number.

20555255 is a deficient number, since it is larger than the sum of its proper divisors (8698057).

20555255 is a wasteful number, since it uses less digits than its factorization.

20555255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1655 (or 1648 counting only the distinct ones).

The product of its (nonzero) digits is 12500, while the sum is 29.

The square root of 20555255 is about 4533.7903568648. The cubic root of 20555255 is about 273.9308570451.

The spelling of 20555255 in words is "twenty million, five hundred fifty-five thousand, two hundred fifty-five".