20761247 has 8 divisors (see below), whose sum is σ = 22394400. Its totient is φ = 19133280.

The previous prime is 20761229. The next prime is 20761253. The reversal of 20761247 is 74216702.

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 20761247 - 2⁸ = 20760991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20761207) 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, 12629 + ... + 14177.

It is an arithmetic number, because the mean of its divisors is an integer number (2799300).

Almost surely, 2^20761247 is an apocalyptic number.

20761247 is a deficient number, since it is larger than the sum of its proper divisors (1633153).

20761247 is a wasteful number, since it uses less digits than its factorization.

20761247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2593.

The product of its (nonzero) digits is 4704, while the sum is 29.

The square root of 20761247 is about 4556.4511409649. The cubic root of 20761247 is about 274.8428722219.

Adding to 20761247 its reverse (74216702), we get a palindrome (94977949).

The spelling of 20761247 in words is "twenty million, seven hundred sixty-one thousand, two hundred forty-seven".