19994955 has 8 divisors (see below), whose sum is σ = 31991952. Its totient is φ = 10663968.

The previous prime is 19994951. The next prime is 19994959. The reversal of 19994955 is 55949991.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (19994951) and next prime (19994959).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 19994955 - 2² = 19994951 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19994898 and 19994907.

It is not an unprimeable number, because it can be changed into a prime (19994951) 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 in 7 ways as a sum of consecutive naturals, for example, 666484 + ... + 666513.

It is an arithmetic number, because the mean of its divisors is an integer number (3998994).

Almost surely, 2^19994955 is an apocalyptic number.

19994955 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

19994955 is a deficient number, since it is larger than the sum of its proper divisors (11996997).

19994955 is a wasteful number, since it uses less digits than its factorization.

19994955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1333005.

The product of its digits is 656100, while the sum is 51.

The square root of 19994955 is about 4471.5718712775. The cubic root of 19994955 is about 271.4189360120.

The spelling of 19994955 in words is "nineteen million, nine hundred ninety-four thousand, nine hundred fifty-five".