20409878783 has 8 divisors (see below), whose sum is σ = 23350371360. Its totient is φ = 17475585120.

The previous prime is 20409878773. The next prime is 20409878803. The reversal of 20409878783 is 38787890402.

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

It is not a de Polignac number, because 20409878783 - 2⁶ = 20409878719 is a prime.

It is a super-2 number, since 2×20409878783² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20409878743) 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, 1542668 + ... + 1555841.

It is an arithmetic number, because the mean of its divisors is an integer number (2918796420).

Almost surely, 2^20409878783 is an apocalyptic number.

20409878783 is a deficient number, since it is larger than the sum of its proper divisors (2940492577).

20409878783 is an equidigital number, since it uses as much as digits as its factorization.

20409878783 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3099457.

The product of its (nonzero) digits is 5419008, while the sum is 56.

The spelling of 20409878783 in words is "twenty billion, four hundred nine million, eight hundred seventy-eight thousand, seven hundred eighty-three".