20328779 has 2 divisors, whose sum is σ = 20328780. Its totient is φ = 20328778.

The previous prime is 20328767. The next prime is 20328793. The reversal of 20328779 is 97782302.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20328779 - 2²⁰ = 19280203 is a prime.

It is not a weakly prime, because it can be changed into another prime (20328079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10164389 + 10164390.

It is an arithmetic number, because the mean of its divisors is an integer number (10164390).

Almost surely, 2^20328779 is an apocalyptic number.

20328779 is a deficient number, since it is larger than the sum of its proper divisors (1).

20328779 is an equidigital number, since it uses as much as digits as its factorization.

20328779 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 42336, while the sum is 38.

The square root of 20328779 is about 4508.7447255306. The cubic root of 20328779 is about 272.9210906754.

It can be divided in two parts, 203 and 28779, that added together give a palindrome (28982).

The spelling of 20328779 in words is "twenty million, three hundred twenty-eight thousand, seven hundred seventy-nine".