20847155880 has 32 divisors (see below), whose sum is σ = 62541468000. Its totient is φ = 5559241536.

The previous prime is 20847155831. The next prime is 20847155887. The reversal of 20847155880 is 8855174802.

It is not an unprimeable number, because it can be changed into a prime (20847155887) 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 7 ways as a sum of consecutive naturals, for example, 86863030 + ... + 86863269.

It is an arithmetic number, because the mean of its divisors is an integer number (1954420875).

Almost surely, 2^20847155880 is an apocalyptic number.

20847155880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20847155880 is an abundant number, since it is smaller than the sum of its proper divisors (41694312120).

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

20847155880 is a wasteful number, since it uses less digits than its factorization.

20847155880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173726313 (or 173726309 counting only the distinct ones).

The product of its (nonzero) digits is 716800, while the sum is 48.

The spelling of 20847155880 in words is "twenty billion, eight hundred forty-seven million, one hundred fifty-five thousand, eight hundred eighty".