20773979 has 2 divisors, whose sum is σ = 20773980. Its totient is φ = 20773978.

The previous prime is 20773969. The next prime is 20773997. The reversal of 20773979 is 97937702.

Together with next prime (20773997) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20773979 - 2¹² = 20769883 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20773939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10386989 + 10386990.

It is an arithmetic number, because the mean of its divisors is an integer number (10386990).

Almost surely, 2^20773979 is an apocalyptic number.

20773979 is a deficient number, since it is larger than the sum of its proper divisors (1).

20773979 is an equidigital number, since it uses as much as digits as its factorization.

20773979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 166698, while the sum is 44.

The square root of 20773979 is about 4557.8480667964. The cubic root of 20773979 is about 274.8990439340.

The spelling of 20773979 in words is "twenty million, seven hundred seventy-three thousand, nine hundred seventy-nine".