19516990 has 32 divisors (see below), whose sum is σ = 37296000. Its totient is φ = 7332768.

The previous prime is 19516963. The next prime is 19516993. The reversal of 19516990 is 9961591.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19516993) 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, 26041 + ... + 26779.

It is an arithmetic number, because the mean of its divisors is an integer number (1165500).

Almost surely, 2^19516990 is an apocalyptic number.

19516990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19516990 is a deficient number, since it is larger than the sum of its proper divisors (17779010).

19516990 is a wasteful number, since it uses less digits than its factorization.

19516990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 904.

The product of its (nonzero) digits is 21870, while the sum is 40.

The square root of 19516990 is about 4417.8037529976. The cubic root of 19516990 is about 269.2387795210.

The spelling of 19516990 in words is "nineteen million, five hundred sixteen thousand, nine hundred ninety".