20386649 has 4 divisors (see below), whose sum is σ = 20411136. Its totient is φ = 20362164.

The previous prime is 20386631. The next prime is 20386651. The reversal of 20386649 is 94668302.

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 not a de Polignac number, because 20386649 - 2²⁴ = 3609433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20386679) 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, 10949 + ... + 12674.

It is an arithmetic number, because the mean of its divisors is an integer number (5102784).

Almost surely, 2^20386649 is an apocalyptic number.

It is an amenable number.

20386649 is a deficient number, since it is larger than the sum of its proper divisors (24487).

20386649 is an equidigital number, since it uses as much as digits as its factorization.

20386649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24486.

The product of its (nonzero) digits is 62208, while the sum is 38.

The square root of 20386649 is about 4515.1576938131. The cubic root of 20386649 is about 273.1798204346.

The spelling of 20386649 in words is "twenty million, three hundred eighty-six thousand, six hundred forty-nine".