20780059 has 2 divisors, whose sum is σ = 20780060. Its totient is φ = 20780058.

The previous prime is 20780057. The next prime is 20780093. The reversal of 20780059 is 95008702.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20780059 - 2¹ = 20780057 is a prime.

Together with 20780057, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20780059.

It is not a weakly prime, because it can be changed into another prime (20780057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10390029 + 10390030.

It is an arithmetic number, because the mean of its divisors is an integer number (10390030).

Almost surely, 2^20780059 is an apocalyptic number.

20780059 is a deficient number, since it is larger than the sum of its proper divisors (1).

20780059 is an equidigital number, since it uses as much as digits as its factorization.

20780059 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 20780059 is about 4558.5149994269. The cubic root of 20780059 is about 274.9258599034.

The spelling of 20780059 in words is "twenty million, seven hundred eighty thousand, fifty-nine".