19900055 has 16 divisors (see below), whose sum is σ = 27371520. Its totient is φ = 13605792.

The previous prime is 19900009. The next prime is 19900057. The reversal of 19900055 is 55000991.

It is a cyclic number.

It is not a de Polignac number, because 19900055 - 2¹² = 19895959 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19900057) 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, 16172 + ... + 17358.

It is an arithmetic number, because the mean of its divisors is an integer number (1710720).

Almost surely, 2^19900055 is an apocalyptic number.

19900055 is a deficient number, since it is larger than the sum of its proper divisors (7471465).

19900055 is a wasteful number, since it uses less digits than its factorization.

19900055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1678.

The product of its (nonzero) digits is 2025, while the sum is 29.

The square root of 19900055 is about 4460.9477692526. The cubic root of 19900055 is about 270.9888522713.

The spelling of 19900055 in words is "nineteen million, nine hundred thousand, fifty-five".