19925966 has 4 divisors (see below), whose sum is σ = 29888952. Its totient is φ = 9962982.

The previous prime is 19925953. The next prime is 19925993. The reversal of 19925966 is 66952991.

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

It is a self number, because there is not a number n which added to its sum of digits gives 19925966.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4981490 + ... + 4981493.

It is an arithmetic number, because the mean of its divisors is an integer number (7472238).

Almost surely, 2^19925966 is an apocalyptic number.

19925966 is a deficient number, since it is larger than the sum of its proper divisors (9962986).

19925966 is an equidigital number, since it uses as much as digits as its factorization.

19925966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9962985.

The product of its digits is 262440, while the sum is 47.

The square root of 19925966 is about 4463.8510279802. The cubic root of 19925966 is about 271.1064155452.

The spelling of 19925966 in words is "nineteen million, nine hundred twenty-five thousand, nine hundred sixty-six".