20669519 has 8 divisors (see below), whose sum is σ = 22733760. Its totient is φ = 18673056.

The previous prime is 20669513. The next prime is 20669527. The reversal of 20669519 is 91596602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20669519 is a prime.

It is a super-2 number, since 2×20669519² = 854458031382722, 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 (20669513) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16304 + ... + 17525.

It is an arithmetic number, because the mean of its divisors is an integer number (2841720).

Almost surely, 2^20669519 is an apocalyptic number.

20669519 is a deficient number, since it is larger than the sum of its proper divisors (2064241).

20669519 is a wasteful number, since it uses less digits than its factorization.

20669519 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33889.

The product of its (nonzero) digits is 29160, while the sum is 38.

The square root of 20669519 is about 4546.3742696791. The cubic root of 20669519 is about 274.4375014619.

The spelling of 20669519 in words is "twenty million, six hundred sixty-nine thousand, five hundred nineteen".