20930649192 has 144 divisors (see below), whose sum is σ = 59115216420. Its totient is φ = 6689571840.

The previous prime is 20930649191. The next prime is 20930649277. The reversal of 20930649192 is 29194603902.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 13255837956 + 7674811236 = 115134^2 + 87606^2 .

It is not an unprimeable number, because it can be changed into a prime (20930649191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 7817358 + ... + 7820034.

Almost surely, 2^20930649192 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20930649192, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29557608210).

20930649192 is an abundant number, since it is smaller than the sum of its proper divisors (38184567228).

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

20930649192 is a wasteful number, since it uses less digits than its factorization.

20930649192 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2864 (or 2826 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 45.

The spelling of 20930649192 in words is "twenty billion, nine hundred thirty million, six hundred forty-nine thousand, one hundred ninety-two".