19990716 has 24 divisors (see below), whose sum is σ = 47209344. Its totient is φ = 6582960.

The previous prime is 19990697. The next prime is 19990721. The reversal of 19990716 is 61709991.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9040 + ... + 11031.

It is an arithmetic number, because the mean of its divisors is an integer number (1967056).

Almost surely, 2^19990716 is an apocalyptic number.

It is an amenable number.

19990716 is an abundant number, since it is smaller than the sum of its proper divisors (27218628).

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

19990716 is a wasteful number, since it uses less digits than its factorization.

19990716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20161 (or 20159 counting only the distinct ones).

The product of its (nonzero) digits is 30618, while the sum is 42.

The square root of 19990716 is about 4471.0978517586. The cubic root of 19990716 is about 271.3997540703.

It can be divided in two parts, 19990 and 716, that added together give a triangular number (20706 = T₂₀₃).

The spelling of 19990716 in words is "nineteen million, nine hundred ninety thousand, seven hundred sixteen".