19955963 has 2 divisors, whose sum is σ = 19955964. Its totient is φ = 19955962.

The previous prime is 19955951. The next prime is 19955989. The reversal of 19955963 is 36955991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19955963 - 2¹⁰ = 19954939 is a prime.

It is not a weakly prime, because it can be changed into another prime (19955933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9977981 + 9977982.

It is an arithmetic number, because the mean of its divisors is an integer number (9977982).

Almost surely, 2^19955963 is an apocalyptic number.

19955963 is a deficient number, since it is larger than the sum of its proper divisors (1).

19955963 is an equidigital number, since it uses as much as digits as its factorization.

19955963 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 328050, while the sum is 47.

The square root of 19955963 is about 4467.2097555409. The cubic root of 19955963 is about 271.2423905784.

The spelling of 19955963 in words is "nineteen million, nine hundred fifty-five thousand, nine hundred sixty-three".