20945783999 has 8 divisors (see below), whose sum is σ = 23942878848. Its totient is φ = 17949899160.

The previous prime is 20945783983. The next prime is 20945784001. The reversal of 20945783999 is 99938754902.

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 20945783999 - 2⁴ = 20945783983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20945753999) 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, 265097 + ... + 334914.

It is an arithmetic number, because the mean of its divisors is an integer number (2992859856).

Almost surely, 2^20945783999 is an apocalyptic number.

20945783999 is a deficient number, since it is larger than the sum of its proper divisors (2997094849).

20945783999 is an equidigital number, since it uses as much as digits as its factorization.

20945783999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 605005.

The product of its (nonzero) digits is 44089920, while the sum is 65.

The spelling of 20945783999 in words is "twenty billion, nine hundred forty-five million, seven hundred eighty-three thousand, nine hundred ninety-nine".