19668077 has 16 divisors (see below), whose sum is σ = 23412480. Its totient is φ = 16286400.

The previous prime is 19668049. The next prime is 19668079. The reversal of 19668077 is 77086691.

It is not a de Polignac number, because 19668077 - 2⁸ = 19667821 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19668079) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10427 + ... + 12167.

It is an arithmetic number, because the mean of its divisors is an integer number (1463280).

Almost surely, 2^19668077 is an apocalyptic number.

It is an amenable number.

19668077 is a deficient number, since it is larger than the sum of its proper divisors (3744403).

19668077 is a wasteful number, since it uses less digits than its factorization.

19668077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1844.

The product of its (nonzero) digits is 127008, while the sum is 44.

The square root of 19668077 is about 4434.8705730833. The cubic root of 19668077 is about 269.9317477231.

The spelling of 19668077 in words is "nineteen million, six hundred sixty-eight thousand, seventy-seven".