20243691 has 12 divisors (see below), whose sum is σ = 31490368. Its totient is φ = 12457584.

The previous prime is 20243689. The next prime is 20243693. The reversal of 20243691 is 19634202.

It is an interprime number because it is at equal distance from previous prime (20243689) and next prime (20243693).

It is not a de Polignac number, because 20243691 - 2¹ = 20243689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20243693) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 86395 + ... + 86628.

Almost surely, 2^20243691 is an apocalyptic number.

20243691 is a deficient number, since it is larger than the sum of its proper divisors (11246677).

20243691 is a wasteful number, since it uses less digits than its factorization.

20243691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173042 (or 173039 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 20243691 is about 4499.2989453914. The cubic root of 20243691 is about 272.5397792838.

Adding to 20243691 its reverse (19634202), we get a palindrome (39877893).

The spelling of 20243691 in words is "twenty million, two hundred forty-three thousand, six hundred ninety-one".