20613255 has 32 divisors (see below), whose sum is σ = 36490944. Its totient is φ = 9870336.

The previous prime is 20613253. The next prime is 20613269. The reversal of 20613255 is 55231602.

It is not a de Polignac number, because 20613255 - 2¹ = 20613253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20613253) 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 31 ways as a sum of consecutive naturals, for example, 5787 + ... + 8643.

It is an arithmetic number, because the mean of its divisors is an integer number (1140342).

Almost surely, 2^20613255 is an apocalyptic number.

20613255 is a deficient number, since it is larger than the sum of its proper divisors (15877689).

20613255 is a wasteful number, since it uses less digits than its factorization.

20613255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2915.

The product of its (nonzero) digits is 1800, while the sum is 24.

The square root of 20613255 is about 4540.1822650638. The cubic root of 20613255 is about 274.1882619370.

Adding to 20613255 its reverse (55231602), we get a palindrome (75844857).

The spelling of 20613255 in words is "twenty million, six hundred thirteen thousand, two hundred fifty-five".