19955707 has 4 divisors (see below), whose sum is σ = 20088016. Its totient is φ = 19823400.

The previous prime is 19955653. The next prime is 19955711. The reversal of 19955707 is 70755991.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 19955707 - 2²³ = 11567099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19955717) 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 3 ways as a sum of consecutive naturals, for example, 65928 + ... + 66229.

It is an arithmetic number, because the mean of its divisors is an integer number (5022004).

Almost surely, 2^19955707 is an apocalyptic number.

19955707 is a deficient number, since it is larger than the sum of its proper divisors (132309).

19955707 is a wasteful number, since it uses less digits than its factorization.

19955707 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132308.

The product of its (nonzero) digits is 99225, while the sum is 43.

The square root of 19955707 is about 4467.1811022165. The cubic root of 19955707 is about 271.2412307188.

The spelling of 19955707 in words is "nineteen million, nine hundred fifty-five thousand, seven hundred seven".