20778299 has 2 divisors, whose sum is σ = 20778300. Its totient is φ = 20778298.

The previous prime is 20778287. The next prime is 20778311. The reversal of 20778299 is 99287702.

It is a balanced prime because it is at equal distance from previous prime (20778287) and next prime (20778311).

It is a cyclic number.

It is not a de Polignac number, because 20778299 - 2⁴ = 20778283 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20778599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10389149 + 10389150.

It is an arithmetic number, because the mean of its divisors is an integer number (10389150).

Almost surely, 2^20778299 is an apocalyptic number.

20778299 is a deficient number, since it is larger than the sum of its proper divisors (1).

20778299 is an equidigital number, since it uses as much as digits as its factorization.

20778299 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 127008, while the sum is 44.

The square root of 20778299 is about 4558.3219500163. The cubic root of 20778299 is about 274.9180979239.

The spelling of 20778299 in words is "twenty million, seven hundred seventy-eight thousand, two hundred ninety-nine".