19690988 has 12 divisors (see below), whose sum is σ = 35299992. Its totient is φ = 9605280.

The previous prime is 19690961. The next prime is 19690991. The reversal of 19690988 is 88909691.

It is a super-2 number, since 2×19690988² = 775470016832288, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59870 + ... + 60197.

It is an arithmetic number, because the mean of its divisors is an integer number (2941666).

Almost surely, 2^19690988 is an apocalyptic number.

It is an amenable number.

19690988 is a deficient number, since it is larger than the sum of its proper divisors (15609004).

19690988 is a wasteful number, since it uses less digits than its factorization.

19690988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120112 (or 120110 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 50.

The square root of 19690988 is about 4437.4528729892. The cubic root of 19690988 is about 270.0365199801.

The spelling of 19690988 in words is "nineteen million, six hundred ninety thousand, nine hundred eighty-eight".