19955955 has 8 divisors (see below), whose sum is σ = 31929552. Its totient is φ = 10643168.

The previous prime is 19955951. The next prime is 19955963. The reversal of 19955955 is 55955991.

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

It is a cyclic number.

It is not a de Polignac number, because 19955955 - 2² = 19955951 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19955951) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 665184 + ... + 665213.

It is an arithmetic number, because the mean of its divisors is an integer number (3991194).

Almost surely, 2^19955955 is an apocalyptic number.

19955955 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

19955955 is a deficient number, since it is larger than the sum of its proper divisors (11973597).

19955955 is a wasteful number, since it uses less digits than its factorization.

19955955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1330405.

The product of its digits is 455625, while the sum is 48.

The square root of 19955955 is about 4467.2088601273. The cubic root of 19955955 is about 271.2423543330.

It can be divided in two parts, 19955 and 955, that added together give a triangular number (20910 = T₂₀₄).

The spelling of 19955955 in words is "nineteen million, nine hundred fifty-five thousand, nine hundred fifty-five".