20189444506 has 16 divisors (see below), whose sum is σ = 37756883520. Its totient is φ = 7866017280.

The previous prime is 20189444501. The next prime is 20189444537. The reversal of 20189444506 is 60544498102.

It is a super-2 number, since 2×20189444506² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20189444501) 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, 65549991 + ... + 65550298.

It is an arithmetic number, because the mean of its divisors is an integer number (2359805220).

Almost surely, 2^20189444506 is an apocalyptic number.

20189444506 is a deficient number, since it is larger than the sum of its proper divisors (17567439014).

20189444506 is a wasteful number, since it uses less digits than its factorization.

20189444506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131100309.

The product of its (nonzero) digits is 276480, while the sum is 43.

The spelling of 20189444506 in words is "twenty billion, one hundred eighty-nine million, four hundred forty-four thousand, five hundred six".