20397747 has 8 divisors (see below), whose sum is σ = 27244800. Its totient is φ = 13574600.

The previous prime is 20397737. The next prime is 20397749. The reversal of 20397747 is 74779302.

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 20397747 - 2¹² = 20393651 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20397749) 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, 3879 + ... + 7472.

It is an arithmetic number, because the mean of its divisors is an integer number (3405600).

Almost surely, 2^20397747 is an apocalyptic number.

20397747 is a deficient number, since it is larger than the sum of its proper divisors (6847053).

20397747 is a wasteful number, since it uses less digits than its factorization.

20397747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11953.

The product of its (nonzero) digits is 74088, while the sum is 39.

The square root of 20397747 is about 4516.3864980756. The cubic root of 20397747 is about 273.2293822773.

The spelling of 20397747 in words is "twenty million, three hundred ninety-seven thousand, seven hundred forty-seven".