20368739 has 4 divisors (see below), whose sum is σ = 20578824. Its totient is φ = 20158656.

The previous prime is 20368727. The next prime is 20368757. The reversal of 20368739 is 93786302.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93786302 = 2 ⋅46893151.

It is a cyclic number.

It is not a de Polignac number, because 20368739 - 2⁴ = 20368723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20368769) 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, 104897 + ... + 105090.

It is an arithmetic number, because the mean of its divisors is an integer number (5144706).

Almost surely, 2^20368739 is an apocalyptic number.

20368739 is a deficient number, since it is larger than the sum of its proper divisors (210085).

20368739 is an equidigital number, since it uses as much as digits as its factorization.

20368739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210084.

The product of its (nonzero) digits is 54432, while the sum is 38.

The square root of 20368739 is about 4513.1739385935. The cubic root of 20368739 is about 273.0997993704.

The spelling of 20368739 in words is "twenty million, three hundred sixty-eight thousand, seven hundred thirty-nine".