20554520541949 has 2 divisors, whose sum is σ = 20554520541950. Its totient is φ = 20554520541948.

The previous prime is 20554520541923. The next prime is 20554520542051. The reversal of 20554520541949 is 94914502545502.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12388745655225 + 8165774886724 = 3519765^2 + 2857582^2 .

It is a cyclic number.

It is not a de Polignac number, because 20554520541949 - 2¹⁷ = 20554520410877 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20554520541949.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20554520841949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10277260270974 + 10277260270975.

It is an arithmetic number, because the mean of its divisors is an integer number (10277260270975).

Almost surely, 2^{20554520541949} is an apocalyptic number.

It is an amenable number.

20554520541949 is a deficient number, since it is larger than the sum of its proper divisors (1).

20554520541949 is an equidigital number, since it uses as much as digits as its factorization.

20554520541949 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960000, while the sum is 55.

The spelling of 20554520541949 in words is "twenty trillion, five hundred fifty-four billion, five hundred twenty million, five hundred forty-one thousand, nine hundred forty-nine".