20861653288 has 32 divisors (see below), whose sum is σ = 47056363200. Its totient is φ = 8470144512.

The previous prime is 20861653277. The next prime is 20861653291. The reversal of 20861653288 is 88235616802.

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 7 ways as a sum of consecutive naturals, for example, 9802345 + ... + 9804472.

It is an arithmetic number, because the mean of its divisors is an integer number (1470511350).

Almost surely, 2^20861653288 is an apocalyptic number.

20861653288 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20861653288 is an abundant number, since it is smaller than the sum of its proper divisors (26194709912).

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

20861653288 is a wasteful number, since it uses less digits than its factorization.

20861653288 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19606849 (or 19606845 counting only the distinct ones).

The product of its (nonzero) digits is 1105920, while the sum is 49.

The spelling of 20861653288 in words is "twenty billion, eight hundred sixty-one million, six hundred fifty-three thousand, two hundred eighty-eight".