19972077 has 4 divisors (see below), whose sum is σ = 26629440. Its totient is φ = 13314716.

The previous prime is 19972067. The next prime is 19972079. The reversal of 19972077 is 77027991.

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 not a de Polignac number, because 19972077 - 2¹⁹ = 19447789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19972079) 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, 3328677 + ... + 3328682.

It is an arithmetic number, because the mean of its divisors is an integer number (6657360).

Almost surely, 2^19972077 is an apocalyptic number.

It is an amenable number.

19972077 is a deficient number, since it is larger than the sum of its proper divisors (6657363).

19972077 is an equidigital number, since it uses as much as digits as its factorization.

19972077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6657362.

The product of its (nonzero) digits is 55566, while the sum is 42.

The square root of 19972077 is about 4469.0129782761. The cubic root of 19972077 is about 271.3153783527.

The spelling of 19972077 in words is "nineteen million, nine hundred seventy-two thousand, seventy-seven".