19730990 has 16 divisors (see below), whose sum is σ = 36476352. Its totient is φ = 7678944.

The previous prime is 19730981. The next prime is 19730993. The reversal of 19730990 is 9903791.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19730993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26294 + ... + 27033.

It is an arithmetic number, because the mean of its divisors is an integer number (2279772).

Almost surely, 2^19730990 is an apocalyptic number.

19730990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19730990 is a deficient number, since it is larger than the sum of its proper divisors (16745362).

19730990 is a wasteful number, since it uses less digits than its factorization.

19730990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53371.

The product of its (nonzero) digits is 15309, while the sum is 38.

The square root of 19730990 is about 4441.9579016465. The cubic root of 19730990 is about 270.2192549180.

The spelling of 19730990 in words is "nineteen million, seven hundred thirty thousand, nine hundred ninety".