20247247 has 8 divisors (see below), whose sum is σ = 21030912. Its totient is φ = 19471800.

The previous prime is 20247239. The next prime is 20247257. The reversal of 20247247 is 74274202.

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

It is a cyclic number.

It is not a de Polignac number, because 20247247 - 2³ = 20247239 is a prime.

It is a super-2 number, since 2×20247247² = 819902022158018, 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 (20247257) 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, 3222 + ... + 7132.

It is an arithmetic number, because the mean of its divisors is an integer number (2628864).

Almost surely, 2^20247247 is an apocalyptic number.

20247247 is a deficient number, since it is larger than the sum of its proper divisors (783665).

20247247 is a wasteful number, since it uses less digits than its factorization.

20247247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4109.

The product of its (nonzero) digits is 6272, while the sum is 28.

The square root of 20247247 is about 4499.6941007140. The cubic root of 20247247 is about 272.5557364317. Note that the first 3 decimals are identical.

The spelling of 20247247 in words is "twenty million, two hundred forty-seven thousand, two hundred forty-seven".