19913055 has 16 divisors (see below), whose sum is σ = 33246720. Its totient is φ = 10158368.

The previous prime is 19913041. The next prime is 19913057. The reversal of 19913055 is 55031991.

It is a cyclic number.

It is not a de Polignac number, because 19913055 - 2⁸ = 19912799 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19913057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28515 + ... + 29204.

It is an arithmetic number, because the mean of its divisors is an integer number (2077920).

Almost surely, 2^19913055 is an apocalyptic number.

19913055 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

19913055 is a deficient number, since it is larger than the sum of its proper divisors (13333665).

19913055 is a wasteful number, since it uses less digits than its factorization.

19913055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57750.

The product of its (nonzero) digits is 6075, while the sum is 33.

The square root of 19913055 is about 4462.4046208294. The cubic root of 19913055 is about 271.0478485612.

The spelling of 19913055 in words is "nineteen million, nine hundred thirteen thousand, fifty-five".