20405651983 has 8 divisors (see below), whose sum is σ = 20672395200. Its totient is φ = 20140420608.

The previous prime is 20405651969. The next prime is 20405652061. The reversal of 20405651983 is 38915650402.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20405651983 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 (20405651963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 350778 + ... + 404791.

It is an arithmetic number, because the mean of its divisors is an integer number (2584049400).

Almost surely, 2^20405651983 is an apocalyptic number.

20405651983 is a deficient number, since it is larger than the sum of its proper divisors (266743217).

20405651983 is a wasteful number, since it uses less digits than its factorization.

20405651983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 755921.

The product of its (nonzero) digits is 259200, while the sum is 43.

The spelling of 20405651983 in words is "twenty billion, four hundred five million, six hundred fifty-one thousand, nine hundred eighty-three".