19980577 has 4 divisors (see below), whose sum is σ = 20070400. Its totient is φ = 19890756.

The previous prime is 19980563. The next prime is 19980637. The reversal of 19980577 is 77508991.

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 19980577 - 2¹⁹ = 19456289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19980557) 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, 44577 + ... + 45022.

It is an arithmetic number, because the mean of its divisors is an integer number (5017600).

Almost surely, 2^19980577 is an apocalyptic number.

It is an amenable number.

19980577 is a deficient number, since it is larger than the sum of its proper divisors (89823).

19980577 is an equidigital number, since it uses as much as digits as its factorization.

19980577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89822.

The product of its (nonzero) digits is 158760, while the sum is 46.

The square root of 19980577 is about 4469.9638701001. The cubic root of 19980577 is about 271.3538629768.

The spelling of 19980577 in words is "nineteen million, nine hundred eighty thousand, five hundred seventy-seven".