19745812 has 6 divisors (see below), whose sum is σ = 34555178. Its totient is φ = 9872904.

The previous prime is 19745809. The next prime is 19745819. The reversal of 19745812 is 21854791.

It can be written as a sum of positive squares in only one way, i.e., 12702096 + 7043716 = 3564^2 + 2654^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19745819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2468223 + ... + 2468230.

Almost surely, 2^19745812 is an apocalyptic number.

It is an amenable number.

19745812 is a deficient number, since it is larger than the sum of its proper divisors (14809366).

19745812 is a wasteful number, since it uses less digits than its factorization.

19745812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4936457 (or 4936455 counting only the distinct ones).

The product of its digits is 20160, while the sum is 37.

The square root of 19745812 is about 4443.6259968634. The cubic root of 19745812 is about 270.2869012501.

The spelling of 19745812 in words is "nineteen million, seven hundred forty-five thousand, eight hundred twelve".