20489784633 has 12 divisors (see below), whose sum is σ = 31337317908. Its totient is φ = 12856335360.

The previous prime is 20489784619. The next prime is 20489784643. The reversal of 20489784633 is 33648798402.

20489784633 is a `hidden beast` number, since 20 + 489 + 7 + 84 + 63 + 3 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 19040688144 + 1449096489 = 137988^2 + 38067^2 .

It is not a de Polignac number, because 20489784633 - 2²⁰ = 20488736057 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20489784633.

It is not an unprimeable number, because it can be changed into a prime (20489784643) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 66959928 + ... + 66960233.

It is an arithmetic number, because the mean of its divisors is an integer number (2611443159).

Almost surely, 2^20489784633 is an apocalyptic number.

It is an amenable number.

20489784633 is a deficient number, since it is larger than the sum of its proper divisors (10847533275).

20489784633 is a wasteful number, since it uses less digits than its factorization.

20489784633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133920184 (or 133920181 counting only the distinct ones).

The product of its (nonzero) digits is 6967296, while the sum is 54.

The spelling of 20489784633 in words is "twenty billion, four hundred eighty-nine million, seven hundred eighty-four thousand, six hundred thirty-three".