20913255 has 32 divisors (see below), whose sum is σ = 40561920. Its totient is φ = 10139040.

The previous prime is 20913229. The next prime is 20913271. The reversal of 20913255 is 55231902.

It is not a de Polignac number, because 20913255 - 2⁹ = 20912743 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5557 + ... + 8526.

It is an arithmetic number, because the mean of its divisors is an integer number (1267560).

Almost surely, 2^20913255 is an apocalyptic number.

20913255 is a deficient number, since it is larger than the sum of its proper divisors (19648665).

20913255 is a wasteful number, since it uses less digits than its factorization.

20913255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14108 (or 14102 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 27.

The square root of 20913255 is about 4573.1012453258. The cubic root of 20913255 is about 275.5120157956.

It can be divided in two parts, 2091 and 3255, that multiplied together give a triangular number (6806205 = T₃₆₈₉).

The spelling of 20913255 in words is "twenty million, nine hundred thirteen thousand, two hundred fifty-five".