20243247 has 8 divisors (see below), whose sum is σ = 27921840. Its totient is φ = 13030080.

The previous prime is 20243233. The next prime is 20243263. The reversal of 20243247 is 74234202.

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

It is not a de Polignac number, because 20243247 - 2¹² = 20239151 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20243207) 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, 116254 + ... + 116427.

It is an arithmetic number, because the mean of its divisors is an integer number (3490230).

Almost surely, 2^20243247 is an apocalyptic number.

20243247 is a deficient number, since it is larger than the sum of its proper divisors (7678593).

20243247 is a wasteful number, since it uses less digits than its factorization.

20243247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232713.

The product of its (nonzero) digits is 2688, while the sum is 24.

The square root of 20243247 is about 4499.2496041007. The cubic root of 20243247 is about 272.5377867528.

Adding to 20243247 its reverse (74234202), we get a palindrome (94477449).

The spelling of 20243247 in words is "twenty million, two hundred forty-three thousand, two hundred forty-seven".