20941577 has 2 divisors, whose sum is σ = 20941578. Its totient is φ = 20941576.

The previous prime is 20941573. The next prime is 20941607. The reversal of 20941577 is 77514902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18913801 + 2027776 = 4349^2 + 1424^2 .

It is a cyclic number.

It is not a de Polignac number, because 20941577 - 2² = 20941573 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20941573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10470788 + 10470789.

It is an arithmetic number, because the mean of its divisors is an integer number (10470789).

Almost surely, 2^20941577 is an apocalyptic number.

It is an amenable number.

20941577 is a deficient number, since it is larger than the sum of its proper divisors (1).

20941577 is an equidigital number, since it uses as much as digits as its factorization.

20941577 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17640, while the sum is 35.

The square root of 20941577 is about 4576.1967833562. The cubic root of 20941577 is about 275.6363313952.

The spelling of 20941577 in words is "twenty million, nine hundred forty-one thousand, five hundred seventy-seven".