20364779 has 4 divisors (see below), whose sum is σ = 20378184. Its totient is φ = 20351376.

The previous prime is 20364769. The next prime is 20364787. The reversal of 20364779 is 97746302.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97746302 = 2 ⋅48873151.

It is a cyclic number.

It is not a de Polignac number, because 20364779 - 2¹⁶ = 20299243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20364709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4082 + ... + 7575.

It is an arithmetic number, because the mean of its divisors is an integer number (5094546).

Almost surely, 2^20364779 is an apocalyptic number.

20364779 is a deficient number, since it is larger than the sum of its proper divisors (13405).

20364779 is a wasteful number, since it uses less digits than its factorization.

20364779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13404.

The product of its (nonzero) digits is 63504, while the sum is 38.

The square root of 20364779 is about 4512.7352016266. The cubic root of 20364779 is about 273.0820999390.

The spelling of 20364779 in words is "twenty million, three hundred sixty-four thousand, seven hundred seventy-nine".