20869351 has 4 divisors (see below), whose sum is σ = 21133600. Its totient is φ = 20605104.

The previous prime is 20869339. The next prime is 20869393. The reversal of 20869351 is 15396802.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20869351 - 2⁷ = 20869223 is a prime.

It is a super-2 number, since 2×20869351² = 871059622322402, 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 (20869151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 132006 + ... + 132163.

It is an arithmetic number, because the mean of its divisors is an integer number (5283400).

Almost surely, 2^20869351 is an apocalyptic number.

20869351 is a deficient number, since it is larger than the sum of its proper divisors (264249).

20869351 is an equidigital number, since it uses as much as digits as its factorization.

20869351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264248.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 20869351 is about 4568.2984797406. The cubic root of 20869351 is about 275.3190830676.

The spelling of 20869351 in words is "twenty million, eight hundred sixty-nine thousand, three hundred fifty-one".