19770641 has 4 divisors (see below), whose sum is σ = 21567984. Its totient is φ = 17973300.

The previous prime is 19770631. The next prime is 19770671. The reversal of 19770641 is 14607791.

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 19770641 - 2⁶ = 19770577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19770631) 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, 898655 + ... + 898676.

It is an arithmetic number, because the mean of its divisors is an integer number (5391996).

Almost surely, 2^19770641 is an apocalyptic number.

19770641 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

19770641 is a deficient number, since it is larger than the sum of its proper divisors (1797343).

19770641 is a wasteful number, since it uses less digits than its factorization.

19770641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1797342.

The product of its (nonzero) digits is 10584, while the sum is 35.

The square root of 19770641 is about 4446.4188961455. The cubic root of 19770641 is about 270.4001428594.

The spelling of 19770641 in words is "nineteen million, seven hundred seventy thousand, six hundred forty-one".