19685868 has 24 divisors (see below), whose sum is σ = 47416320. Its totient is φ = 6350160.

The previous prime is 19685851. The next prime is 19685879. The reversal of 19685868 is 86858691.

It is a self number, because there is not a number n which added to its sum of digits gives 19685868.

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, 26088 + ... + 26831.

It is an arithmetic number, because the mean of its divisors is an integer number (1975680).

Almost surely, 2^19685868 is an apocalyptic number.

It is an amenable number.

19685868 is an abundant number, since it is smaller than the sum of its proper divisors (27730452).

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

19685868 is a wasteful number, since it uses less digits than its factorization.

19685868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52957 (or 52955 counting only the distinct ones).

The product of its digits is 829440, while the sum is 51.

The square root of 19685868 is about 4436.8759279475. The cubic root of 19685868 is about 270.0131132177.

It can be divided in two parts, 1 and 9685868, that added together give a palindrome (9685869).

The spelling of 19685868 in words is "nineteen million, six hundred eighty-five thousand, eight hundred sixty-eight".