19989690 has 32 divisors (see below), whose sum is σ = 54829440. Its totient is φ = 4569024.

The previous prime is 19989689. The next prime is 19989701. The reversal of 19989690 is 9698991.

It is a super-2 number, since 2×19989690² = 799175412592200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47385 + ... + 47804.

It is an arithmetic number, because the mean of its divisors is an integer number (1713420).

Almost surely, 2^19989690 is an apocalyptic number.

19989690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19989690 is an abundant number, since it is smaller than the sum of its proper divisors (34839750).

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

19989690 is a wasteful number, since it uses less digits than its factorization.

19989690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95206.

The product of its (nonzero) digits is 314928, while the sum is 51.

The square root of 19989690 is about 4470.9831133656. The cubic root of 19989690 is about 271.3951108997.

The spelling of 19989690 in words is "nineteen million, nine hundred eighty-nine thousand, six hundred ninety".