20739269 has 4 divisors (see below), whose sum is σ = 21959244. Its totient is φ = 19519296.

The previous prime is 20739253. The next prime is 20739283. The reversal of 20739269 is 96293702.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 96293702 = 2 ⋅48146851.

It can be written as a sum of positive squares in 2 ways, for example, as 13653025 + 7086244 = 3695^2 + 2662^2 .

It is a cyclic number.

It is not a de Polignac number, because 20739269 - 2⁴ = 20739253 is a prime.

It is a super-2 number, since 2×20739269² = 860234557308722, 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 (20739209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 609962 + ... + 609995.

It is an arithmetic number, because the mean of its divisors is an integer number (5489811).

Almost surely, 2^20739269 is an apocalyptic number.

It is an amenable number.

20739269 is a deficient number, since it is larger than the sum of its proper divisors (1219975).

20739269 is a wasteful number, since it uses less digits than its factorization.

20739269 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1219974.

The product of its (nonzero) digits is 40824, while the sum is 38.

The square root of 20739269 is about 4554.0387569717. The cubic root of 20739269 is about 274.7458544560.

The spelling of 20739269 in words is "twenty million, seven hundred thirty-nine thousand, two hundred sixty-nine".