19979955 has 12 divisors (see below), whose sum is σ = 34632000. Its totient is φ = 10655952.

The previous prime is 19979941. The next prime is 19979959. The reversal of 19979955 is 55997991.

It is not a de Polignac number, because 19979955 - 2⁵ = 19979923 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19979959) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 221955 + ... + 222044.

It is an arithmetic number, because the mean of its divisors is an integer number (2886000).

Almost surely, 2^19979955 is an apocalyptic number.

19979955 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

19979955 is a deficient number, since it is larger than the sum of its proper divisors (14652045).

19979955 is a wasteful number, since it uses less digits than its factorization.

19979955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444010 (or 444007 counting only the distinct ones).

The product of its digits is 1148175, while the sum is 54.

The square root of 19979955 is about 4469.8942940522. The cubic root of 19979955 is about 271.3510471780.

The spelling of 19979955 in words is "nineteen million, nine hundred seventy-nine thousand, nine hundred fifty-five".