20439782533 has 16 divisors (see below), whose sum is σ = 21952809216. Its totient is φ = 18961620480.

The previous prime is 20439782509. The next prime is 20439782543. The reversal of 20439782533 is 33528793402.

It is not a de Polignac number, because 20439782533 - 2²¹ = 20437685381 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 (20439782543) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2317510 + ... + 2326312.

It is an arithmetic number, because the mean of its divisors is an integer number (1372050576).

Almost surely, 2^20439782533 is an apocalyptic number.

It is an amenable number.

20439782533 is a deficient number, since it is larger than the sum of its proper divisors (1513026683).

20439782533 is a wasteful number, since it uses less digits than its factorization.

20439782533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10764.

The product of its (nonzero) digits is 1088640, while the sum is 46.

The spelling of 20439782533 in words is "twenty billion, four hundred thirty-nine million, seven hundred eighty-two thousand, five hundred thirty-three".