20387255 has 16 divisors (see below), whose sum is σ = 28064064. Its totient is φ = 13927680.

The previous prime is 20387249. The next prime is 20387287. The reversal of 20387255 is 55278302.

It is not a de Polignac number, because 20387255 - 2⁸ = 20386999 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10025 + ... + 11885.

It is an arithmetic number, because the mean of its divisors is an integer number (1754004).

Almost surely, 2^20387255 is an apocalyptic number.

20387255 is a deficient number, since it is larger than the sum of its proper divisors (7676809).

20387255 is a wasteful number, since it uses less digits than its factorization.

20387255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2186.

The product of its (nonzero) digits is 16800, while the sum is 32.

The square root of 20387255 is about 4515.2248006052. The cubic root of 20387255 is about 273.1825271951.

The spelling of 20387255 in words is "twenty million, three hundred eighty-seven thousand, two hundred fifty-five".