20497255 has 16 divisors (see below), whose sum is σ = 25873344. Its totient is φ = 15558400.

The previous prime is 20497247. The next prime is 20497271. The reversal of 20497255 is 55279402.

It is not a de Polignac number, because 20497255 - 2³ = 20497247 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20497255.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 15105 + ... + 16405.

It is an arithmetic number, because the mean of its divisors is an integer number (1617084).

Almost surely, 2^20497255 is an apocalyptic number.

20497255 is a deficient number, since it is larger than the sum of its proper divisors (5376089).

20497255 is a wasteful number, since it uses less digits than its factorization.

20497255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1466.

The product of its (nonzero) digits is 25200, while the sum is 34.

The square root of 20497255 is about 4527.3894243813. The cubic root of 20497255 is about 273.6729674901.

The spelling of 20497255 in words is "twenty million, four hundred ninety-seven thousand, two hundred fifty-five".