20144561783 has 8 divisors (see below), whose sum is σ = 20615485968. Its totient is φ = 19673748864.

The previous prime is 20144561779. The next prime is 20144561797. The reversal of 20144561783 is 38716544102.

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 20144561783 - 2² = 20144561779 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20144561783.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20144561183) 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, 422735 + ... + 467967.

It is an arithmetic number, because the mean of its divisors is an integer number (2576935746).

Almost surely, 2^20144561783 is an apocalyptic number.

20144561783 is a deficient number, since it is larger than the sum of its proper divisors (470924185).

20144561783 is a wasteful number, since it uses less digits than its factorization.

20144561783 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55633.

The product of its (nonzero) digits is 161280, while the sum is 41.

The spelling of 20144561783 in words is "twenty billion, one hundred forty-four million, five hundred sixty-one thousand, seven hundred eighty-three".