20197247 has 16 divisors (see below), whose sum is σ = 24460800. Its totient is φ = 16290720.

The previous prime is 20197237. The next prime is 20197249. The reversal of 20197247 is 74279102.

It is a cyclic number.

It is not a de Polignac number, because 20197247 - 2⁶ = 20197183 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20197249) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23654 + ... + 24492.

It is an arithmetic number, because the mean of its divisors is an integer number (1528800).

Almost surely, 2^20197247 is an apocalyptic number.

20197247 is a deficient number, since it is larger than the sum of its proper divisors (4263553).

20197247 is a wasteful number, since it uses less digits than its factorization.

20197247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1046.

The product of its (nonzero) digits is 7056, while the sum is 32.

The square root of 20197247 is about 4494.1347331828. The cubic root of 20197247 is about 272.3311952871.

The spelling of 20197247 in words is "twenty million, one hundred ninety-seven thousand, two hundred forty-seven".