20658851340 has 48 divisors (see below), whose sum is σ = 57853850208. Its totient is φ = 5508163584.

The previous prime is 20658851303. The next prime is 20658851359. The reversal of 20658851340 is 4315885602.

It is a junction number, because it is equal to n+sod(n) for n = 20658851292 and 20658851301.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 420294 + ... + 466866.

It is an arithmetic number, because the mean of its divisors is an integer number (1205288546).

Almost surely, 2^20658851340 is an apocalyptic number.

20658851340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20658851340 is an abundant number, since it is smaller than the sum of its proper divisors (37194998868).

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

20658851340 is a wasteful number, since it uses less digits than its factorization.

20658851340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53978 (or 53976 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 42.

The spelling of 20658851340 in words is "twenty billion, six hundred fifty-eight million, eight hundred fifty-one thousand, three hundred forty".