20383042644 has 18 divisors (see below), whose sum is σ = 51523802330. Its totient is φ = 6794347536.

The previous prime is 20383042627. The next prime is 20383042649. The reversal of 20383042644 is 44624038302.

20383042644 is a `hidden beast` number, since 2 + 0 + 3 + 8 + 3 + 0 + 4 + 2 + 644 = 666.

It can be written as a sum of positive squares in only one way, i.e., 11022480144 + 9360562500 = 104988^2 + 96750^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 566195629 = 20383042644 / (2 + 0 + 3 + 8 + 3 + 0 + 4 + 2 + 6 + 4 + 4).

It is a junction number, because it is equal to n+sod(n) for n = 20383042599 and 20383042608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20383042649) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 283097779 + ... + 283097850.

Almost surely, 2^20383042644 is an apocalyptic number.

It is an amenable number.

20383042644 is an abundant number, since it is smaller than the sum of its proper divisors (31140759686).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20383042644 is a wasteful number, since it uses less digits than its factorization.

20383042644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 566195639 (or 566195634 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 36.

The spelling of 20383042644 in words is "twenty billion, three hundred eighty-three million, forty-two thousand, six hundred forty-four".