20902669 has 4 divisors (see below), whose sum is σ = 21467644. Its totient is φ = 20337696.

The previous prime is 20902667. The next prime is 20902691. The reversal of 20902669 is 96620902.

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

It can be written as a sum of positive squares in 2 ways, for example, as 11055625 + 9847044 = 3325^2 + 3138^2 .

It is a cyclic number.

It is not a de Polignac number, because 20902669 - 2¹ = 20902667 is a prime.

It is a super-2 number, since 2×20902669² = 873843142647122, 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 (20902667) 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, 282432 + ... + 282505.

It is an arithmetic number, because the mean of its divisors is an integer number (5366911).

Almost surely, 2^20902669 is an apocalyptic number.

It is an amenable number.

20902669 is a deficient number, since it is larger than the sum of its proper divisors (564975).

20902669 is an equidigital number, since it uses as much as digits as its factorization.

20902669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 564974.

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 20902669 is about 4571.9436785682. The cubic root of 20902669 is about 275.4655211610.

The spelling of 20902669 in words is "twenty million, nine hundred two thousand, six hundred sixty-nine".