20257263 has 16 divisors (see below), whose sum is σ = 32319840. Its totient is φ = 12465792.

The previous prime is 20257261. The next prime is 20257271. The reversal of 20257263 is 36275202.

It is not a de Polignac number, because 20257263 - 2¹ = 20257261 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 not an unprimeable number, because it can be changed into a prime (20257261) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28506 + ... + 29207.

It is an arithmetic number, because the mean of its divisors is an integer number (2019990).

Almost surely, 2^20257263 is an apocalyptic number.

20257263 is a deficient number, since it is larger than the sum of its proper divisors (12062577).

20257263 is a wasteful number, since it uses less digits than its factorization.

20257263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57735 (or 57729 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 27.

The square root of 20257263 is about 4500.8069276520. The cubic root of 20257263 is about 272.6006720589.

The spelling of 20257263 in words is "twenty million, two hundred fifty-seven thousand, two hundred sixty-three".