20137247 has 8 divisors (see below), whose sum is σ = 21858816. Its totient is φ = 18440352.

The previous prime is 20137241. The next prime is 20137253. The reversal of 20137247 is 74273102.

It is an interprime number because it is at equal distance from previous prime (20137241) and next prime (20137253).

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 20137247 - 2¹⁸ = 19875103 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 (20137241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4448 + ... + 7749.

It is an arithmetic number, because the mean of its divisors is an integer number (2732352).

Almost surely, 2^20137247 is an apocalyptic number.

20137247 is a deficient number, since it is larger than the sum of its proper divisors (1721569).

20137247 is a wasteful number, since it uses less digits than its factorization.

20137247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12337.

The product of its (nonzero) digits is 2352, while the sum is 26.

The square root of 20137247 is about 4487.4544008825. The cubic root of 20137247 is about 272.0612562080.

The spelling of 20137247 in words is "twenty million, one hundred thirty-seven thousand, two hundred forty-seven".