20319199489 has 4 divisors (see below), whose sum is σ = 20791739056. Its totient is φ = 19846659924.

The previous prime is 20319199487. The next prime is 20319199501. The reversal of 20319199489 is 98499191302.

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 20319199489 - 2¹ = 20319199487 is a prime.

It is a super-2 number, since 2×20319199489² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20319199487) 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, 236269719 + ... + 236269804.

It is an arithmetic number, because the mean of its divisors is an integer number (5197934764).

Almost surely, 2^20319199489 is an apocalyptic number.

It is an amenable number.

20319199489 is a deficient number, since it is larger than the sum of its proper divisors (472539567).

20319199489 is an equidigital number, since it uses as much as digits as its factorization.

20319199489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 472539566.

The product of its (nonzero) digits is 1259712, while the sum is 55.

The spelling of 20319199489 in words is "twenty billion, three hundred nineteen million, one hundred ninety-nine thousand, four hundred eighty-nine".