20842049 has 2 divisors, whose sum is σ = 20842050. Its totient is φ = 20842048.

The previous prime is 20842043. The next prime is 20842093. The reversal of 20842049 is 94024802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14961424 + 5880625 = 3868^2 + 2425^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20842049 is a prime.

It is not a weakly prime, because it can be changed into another prime (20842043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10421024 + 10421025.

It is an arithmetic number, because the mean of its divisors is an integer number (10421025).

Almost surely, 2^20842049 is an apocalyptic number.

It is an amenable number.

20842049 is a deficient number, since it is larger than the sum of its proper divisors (1).

20842049 is an equidigital number, since it uses as much as digits as its factorization.

20842049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 20842049 is about 4565.3092994889. The cubic root of 20842049 is about 275.1989700546.

The spelling of 20842049 in words is "twenty million, eight hundred forty-two thousand, forty-nine".