19955830 has 8 divisors (see below), whose sum is σ = 35920512. Its totient is φ = 7982328.

The previous prime is 19955809. The next prime is 19955843. The reversal of 19955830 is 3855991.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 997782 + ... + 997801.

It is an arithmetic number, because the mean of its divisors is an integer number (4490064).

Almost surely, 2^19955830 is an apocalyptic number.

19955830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19955830 is a deficient number, since it is larger than the sum of its proper divisors (15964682).

19955830 is a wasteful number, since it uses less digits than its factorization.

19955830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1995590.

The product of its (nonzero) digits is 48600, while the sum is 40.

The square root of 19955830 is about 4467.1948692664. The cubic root of 19955830 is about 271.2417879963.

The spelling of 19955830 in words is "nineteen million, nine hundred fifty-five thousand, eight hundred thirty".