20857715086 has 16 divisors (see below), whose sum is σ = 33744387600. Its totient is φ = 9612021888.

The previous prime is 20857715077. The next prime is 20857715093. The reversal of 20857715086 is 68051775802.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 591531 + ... + 625798.

It is an arithmetic number, because the mean of its divisors is an integer number (2109024225).

Almost surely, 2^20857715086 is an apocalyptic number.

20857715086 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

20857715086 is a deficient number, since it is larger than the sum of its proper divisors (12886672514).

20857715086 is a wasteful number, since it uses less digits than its factorization.

20857715086 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1218003.

The product of its (nonzero) digits is 940800, while the sum is 49.

The spelling of 20857715086 in words is "twenty billion, eight hundred fifty-seven million, seven hundred fifteen thousand, eighty-six".