20396743 has 4 divisors (see below), whose sum is σ = 20701240. Its totient is φ = 20092248.

The previous prime is 20396741. The next prime is 20396767. The reversal of 20396743 is 34769302.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34769302 = 2 ⋅17384651.

It is a cyclic number.

It is not a de Polignac number, because 20396743 - 2¹ = 20396741 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20396699 and 20396708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20396741) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 152148 + ... + 152281.

It is an arithmetic number, because the mean of its divisors is an integer number (5175310).

Almost surely, 2^20396743 is an apocalyptic number.

20396743 is a deficient number, since it is larger than the sum of its proper divisors (304497).

20396743 is an equidigital number, since it uses as much as digits as its factorization.

20396743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304496.

The product of its (nonzero) digits is 27216, while the sum is 34.

The square root of 20396743 is about 4516.2753459018. The cubic root of 20396743 is about 273.2248993182.

The spelling of 20396743 in words is "twenty million, three hundred ninety-six thousand, seven hundred forty-three".