19906553 has 2 divisors, whose sum is σ = 19906554. Its totient is φ = 19906552.

The previous prime is 19906531. The next prime is 19906577. The reversal of 19906553 is 35560991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17707264 + 2199289 = 4208^2 + 1483^2 .

It is a cyclic number.

It is not a de Polignac number, because 19906553 - 2⁶ = 19906489 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (19906583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9953276 + 9953277.

It is an arithmetic number, because the mean of its divisors is an integer number (9953277).

Almost surely, 2^19906553 is an apocalyptic number.

It is an amenable number.

19906553 is a deficient number, since it is larger than the sum of its proper divisors (1).

19906553 is an equidigital number, since it uses as much as digits as its factorization.

19906553 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36450, while the sum is 38.

The square root of 19906553 is about 4461.6760303724. The cubic root of 19906553 is about 271.0183445505.

The spelling of 19906553 in words is "nineteen million, nine hundred six thousand, five hundred fifty-three".