20906259 has 12 divisors (see below), whose sum is σ = 30640008. Its totient is φ = 12670240.

The previous prime is 20906257. The next prime is 20906261. The reversal of 20906259 is 95260902.

It is an interprime number because it is at equal distance from previous prime (20906257) and next prime (20906261).

It is not a de Polignac number, because 20906259 - 2¹ = 20906257 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (20906257) 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 11 ways as a sum of consecutive naturals, for example, 28434 + ... + 29159.

It is an arithmetic number, because the mean of its divisors is an integer number (2553334).

Almost surely, 2^20906259 is an apocalyptic number.

20906259 is a deficient number, since it is larger than the sum of its proper divisors (9733749).

20906259 is a wasteful number, since it uses less digits than its factorization.

20906259 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57618 (or 57607 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 33.

The square root of 20906259 is about 4572.3362737227. The cubic root of 20906259 is about 275.4812905126.

The spelling of 20906259 in words is "twenty million, nine hundred six thousand, two hundred fifty-nine".