19949855 has 16 divisors (see below), whose sum is σ = 25519104. Its totient is φ = 14937120.

The previous prime is 19949851. The next prime is 19949863. The reversal of 19949855 is 55894991.

It is not a de Polignac number, because 19949855 - 2² = 19949851 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19949851) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3560 + ... + 7250.

It is an arithmetic number, because the mean of its divisors is an integer number (1594944).

Almost surely, 2^19949855 is an apocalyptic number.

19949855 is a deficient number, since it is larger than the sum of its proper divisors (5569249).

19949855 is a wasteful number, since it uses less digits than its factorization.

19949855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3766.

The product of its digits is 583200, while the sum is 50.

The square root of 19949855 is about 4466.5260550007. The cubic root of 19949855 is about 271.2147143465.

The spelling of 19949855 in words is "nineteen million, nine hundred forty-nine thousand, eight hundred fifty-five".