20902269 has 4 divisors (see below), whose sum is σ = 27869696. Its totient is φ = 13934844.

The previous prime is 20902241. The next prime is 20902279. The reversal of 20902269 is 96220902.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 20902269 - 2⁵ = 20902237 is a prime.

It is a super-2 number, since 2×20902269² = 873809698696722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20902279) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3483709 + ... + 3483714.

It is an arithmetic number, because the mean of its divisors is an integer number (6967424).

Almost surely, 2^20902269 is an apocalyptic number.

It is an amenable number.

20902269 is a deficient number, since it is larger than the sum of its proper divisors (6967427).

20902269 is an equidigital number, since it uses as much as digits as its factorization.

20902269 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6967426.

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 20902269 is about 4571.8999332881. The cubic root of 20902269 is about 275.4637640184.

The spelling of 20902269 in words is "twenty million, nine hundred two thousand, two hundred sixty-nine".