20692541 has 2 divisors, whose sum is σ = 20692542. Its totient is φ = 20692540.

The previous prime is 20692523. The next prime is 20692543. The reversal of 20692541 is 14529602.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17556100 + 3136441 = 4190^2 + 1771^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20692541 is a prime.

It is a Sophie Germain prime.

Together with 20692543, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20692543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10346270 + 10346271.

It is an arithmetic number, because the mean of its divisors is an integer number (10346271).

Almost surely, 2^20692541 is an apocalyptic number.

It is an amenable number.

20692541 is a deficient number, since it is larger than the sum of its proper divisors (1).

20692541 is an equidigital number, since it uses as much as digits as its factorization.

20692541 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 20692541 is about 4548.9054727484. The cubic root of 20692541 is about 274.5393544349.

The spelling of 20692541 in words is "twenty million, six hundred ninety-two thousand, five hundred forty-one".