19820769 has 4 divisors (see below), whose sum is σ = 26427696. Its totient is φ = 13213844.

The previous prime is 19820747. The next prime is 19820777. The reversal of 19820769 is 96702891.

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, and also an emirpimes, since its reverse is a distinct semiprime: 96702891 = 3 ⋅32234297.

It is a cyclic number.

It is not a de Polignac number, because 19820769 - 2⁵ = 19820737 is a prime.

It is a super-2 number, since 2×19820769² = 785725767502722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 19820769.

It is not an unprimeable number, because it can be changed into a prime (19820069) 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, 3303459 + ... + 3303464.

It is an arithmetic number, because the mean of its divisors is an integer number (6606924).

Almost surely, 2^19820769 is an apocalyptic number.

It is an amenable number.

19820769 is a deficient number, since it is larger than the sum of its proper divisors (6606927).

19820769 is an equidigital number, since it uses as much as digits as its factorization.

19820769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6606926.

The product of its (nonzero) digits is 54432, while the sum is 42.

The square root of 19820769 is about 4452.0522234134. The cubic root of 19820769 is about 270.6284810750.

The spelling of 19820769 in words is "nineteen million, eight hundred twenty thousand, seven hundred sixty-nine".