19928090 has 64 divisors (see below), whose sum is σ = 44997120. Its totient is φ = 6186240.

The previous prime is 19928057. The next prime is 19928101. The reversal of 19928090 is 9082991.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 55331 + ... + 55689.

It is an arithmetic number, because the mean of its divisors is an integer number (703080).

Almost surely, 2^19928090 is an apocalyptic number.

19928090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19928090 is an abundant number, since it is smaller than the sum of its proper divisors (25069030).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19928090 is a wasteful number, since it uses less digits than its factorization.

19928090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 447.

The product of its (nonzero) digits is 11664, while the sum is 38.

The square root of 19928090 is about 4464.0889328059. The cubic root of 19928090 is about 271.1160480279.

The spelling of 19928090 in words is "nineteen million, nine hundred twenty-eight thousand, ninety".