20396737 has 4 divisors (see below), whose sum is σ = 20493616. Its totient is φ = 20299860.

The previous prime is 20396689. The next prime is 20396741. The reversal of 20396737 is 73769302.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20396737 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20396696 and 20396705.

It is not an unprimeable number, because it can be changed into a prime (20396767) 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 3 ways as a sum of consecutive naturals, for example, 48123 + ... + 48544.

It is an arithmetic number, because the mean of its divisors is an integer number (5123404).

Almost surely, 2^20396737 is an apocalyptic number.

It is an amenable number.

20396737 is a deficient number, since it is larger than the sum of its proper divisors (96879).

20396737 is an equidigital number, since it uses as much as digits as its factorization.

20396737 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96878.

The product of its (nonzero) digits is 47628, while the sum is 37.

The square root of 20396737 is about 4516.2746816375. The cubic root of 20396737 is about 273.2248725271.

The spelling of 20396737 in words is "twenty million, three hundred ninety-six thousand, seven hundred thirty-seven".