19940686 has 4 divisors (see below), whose sum is σ = 29911032. Its totient is φ = 9970342.

The previous prime is 19940663. The next prime is 19940693. The reversal of 19940686 is 68604991.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4985170 + ... + 4985173.

It is an arithmetic number, because the mean of its divisors is an integer number (7477758).

Almost surely, 2^19940686 is an apocalyptic number.

19940686 is a deficient number, since it is larger than the sum of its proper divisors (9970346).

19940686 is an equidigital number, since it uses as much as digits as its factorization.

19940686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9970345.

The product of its (nonzero) digits is 93312, while the sum is 43.

The square root of 19940686 is about 4465.4995241294. The cubic root of 19940686 is about 271.1731576738.

The spelling of 19940686 in words is "nineteen million, nine hundred forty thousand, six hundred eighty-six".