19930990 has 16 divisors (see below), whose sum is σ = 35966448. Its totient is φ = 7952256.

The previous prime is 19930921. The next prime is 19930991. The reversal of 19930990 is 9903991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19930991) 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 7 ways as a sum of consecutive naturals, for example, 2029 + ... + 6631.

It is an arithmetic number, because the mean of its divisors is an integer number (2247903).

Almost surely, 2^19930990 is an apocalyptic number.

19930990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19930990 is a deficient number, since it is larger than the sum of its proper divisors (16035458).

19930990 is a wasteful number, since it uses less digits than its factorization.

19930990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5043.

The product of its (nonzero) digits is 19683, while the sum is 40.

The square root of 19930990 is about 4464.4137353072. The cubic root of 19930990 is about 271.1291986176.

The spelling of 19930990 in words is "nineteen million, nine hundred thirty thousand, nine hundred ninety".