20355541 has 2 divisors, whose sum is σ = 20355542. Its totient is φ = 20355540.

The previous prime is 20355523. The next prime is 20355553. The reversal of 20355541 is 14555302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20295025 + 60516 = 4505^2 + 246^2 .

It is a cyclic number.

It is not a de Polignac number, because 20355541 - 2⁵ = 20355509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20355571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10177770 + 10177771.

It is an arithmetic number, because the mean of its divisors is an integer number (10177771).

Almost surely, 2^20355541 is an apocalyptic number.

It is an amenable number.

20355541 is a deficient number, since it is larger than the sum of its proper divisors (1).

20355541 is an equidigital number, since it uses as much as digits as its factorization.

20355541 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 20355541 is about 4511.7115377648. The cubic root of 20355541 is about 273.0408012832.

The spelling of 20355541 in words is "twenty million, three hundred fifty-five thousand, five hundred forty-one".