20521682085 has 8 divisors (see below), whose sum is σ = 32834691360. Its totient is φ = 10944897104.

The previous prime is 20521682053. The next prime is 20521682131. The reversal of 20521682085 is 58028612502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20521682085 - 2⁵ = 20521682053 is a prime.

It is a super-2 number, since 2×20521682085² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 684056055 + ... + 684056084.

It is an arithmetic number, because the mean of its divisors is an integer number (4104336420).

Almost surely, 2^20521682085 is an apocalyptic number.

It is an amenable number.

20521682085 is a deficient number, since it is larger than the sum of its proper divisors (12313009275).

20521682085 is a wasteful number, since it uses less digits than its factorization.

20521682085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1368112147.

The product of its (nonzero) digits is 76800, while the sum is 39.

The spelling of 20521682085 in words is "twenty billion, five hundred twenty-one million, six hundred eighty-two thousand, eighty-five".