20752247 has 4 divisors (see below), whose sum is σ = 21104040. Its totient is φ = 20400456.

The previous prime is 20752243. The next prime is 20752267. The reversal of 20752247 is 74225702.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74225702 = 2 ⋅37112851.

It is a cyclic number.

It is not a de Polignac number, because 20752247 - 2² = 20752243 is a prime.

It is a super-3 number, since 3×20752247³ (a number of 23 digits) contains 333 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 (20752243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 175808 + ... + 175925.

It is an arithmetic number, because the mean of its divisors is an integer number (5276010).

Almost surely, 2^20752247 is an apocalyptic number.

20752247 is a deficient number, since it is larger than the sum of its proper divisors (351793).

20752247 is an equidigital number, since it uses as much as digits as its factorization.

20752247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351792.

The product of its (nonzero) digits is 7840, while the sum is 29.

The square root of 20752247 is about 4555.4634231876. The cubic root of 20752247 is about 274.8031516892.

Adding to 20752247 its reverse (74225702), we get a palindrome (94977949).

The spelling of 20752247 in words is "twenty million, seven hundred fifty-two thousand, two hundred forty-seven".