20775541 has 2 divisors, whose sum is σ = 20775542. Its totient is φ = 20775540.

The previous prime is 20775539. The next prime is 20775577. The reversal of 20775541 is 14557702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16573041 + 4202500 = 4071^2 + 2050^2 .

It is a cyclic number.

It is not a de Polignac number, because 20775541 - 2¹ = 20775539 is a prime.

Together with 20775539, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20775511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10387770 + 10387771.

It is an arithmetic number, because the mean of its divisors is an integer number (10387771).

Almost surely, 2^20775541 is an apocalyptic number.

It is an amenable number.

20775541 is a deficient number, since it is larger than the sum of its proper divisors (1).

20775541 is an equidigital number, since it uses as much as digits as its factorization.

20775541 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9800, while the sum is 31.

The square root of 20775541 is about 4558.0194163694. The cubic root of 20775541 is about 274.9059336676.

It can be divided in two parts, 20775 and 541, that added together give a square (21316 = 146²).

The spelling of 20775541 in words is "twenty million, seven hundred seventy-five thousand, five hundred forty-one".