19900473 has 4 divisors (see below), whose sum is σ = 26533968. Its totient is φ = 13266980.

The previous prime is 19900471. The next prime is 19900477. The reversal of 19900473 is 37400991.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 19900473 - 2¹ = 19900471 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (19900471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3316743 + ... + 3316748.

It is an arithmetic number, because the mean of its divisors is an integer number (6633492).

Almost surely, 2^19900473 is an apocalyptic number.

It is an amenable number.

19900473 is a deficient number, since it is larger than the sum of its proper divisors (6633495).

19900473 is an equidigital number, since it uses as much as digits as its factorization.

19900473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6633494.

The product of its (nonzero) digits is 6804, while the sum is 33.

The square root of 19900473 is about 4460.9946200371. The cubic root of 19900473 is about 270.9907496286.

The spelling of 19900473 in words is "nineteen million, nine hundred thousand, four hundred seventy-three".