20449248709 has 8 divisors (see below), whose sum is σ = 20864630808. Its totient is φ = 20038041600.

The previous prime is 20449248661. The next prime is 20449248713. The reversal of 20449248709 is 90784294402.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 14120568900 + 6328679809 = 118830^2 + 79553^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20449248709 - 2¹¹ = 20449246661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20449248409) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1033852 + ... + 1053445.

It is an arithmetic number, because the mean of its divisors is an integer number (2608078851).

Almost surely, 2^20449248709 is an apocalyptic number.

It is an amenable number.

20449248709 is a deficient number, since it is larger than the sum of its proper divisors (415382099).

20449248709 is a wasteful number, since it uses less digits than its factorization.

20449248709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2087495.

The product of its (nonzero) digits is 1161216, while the sum is 49.

The spelling of 20449248709 in words is "twenty billion, four hundred forty-nine million, two hundred forty-eight thousand, seven hundred nine".