19960657 has 4 divisors (see below), whose sum is σ = 19977280. Its totient is φ = 19944036.

The previous prime is 19960637. The next prime is 19960663. The reversal of 19960657 is 75606991.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19960657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19960627) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6357 + ... + 8962.

It is an arithmetic number, because the mean of its divisors is an integer number (4994320).

Almost surely, 2^19960657 is an apocalyptic number.

It is an amenable number.

19960657 is a deficient number, since it is larger than the sum of its proper divisors (16623).

19960657 is a wasteful number, since it uses less digits than its factorization.

19960657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16622.

The product of its (nonzero) digits is 102060, while the sum is 43.

The square root of 19960657 is about 4467.7351085309. The cubic root of 19960657 is about 271.2636559343.

The spelling of 19960657 in words is "nineteen million, nine hundred sixty thousand, six hundred fifty-seven".