20157021285 has 32 divisors (see below), whose sum is σ = 32461368192. Its totient is φ = 10680526080.

The previous prime is 20157021259. The next prime is 20157021317. The reversal of 20157021285 is 58212075102.

It is not a de Polignac number, because 20157021285 - 2⁵ = 20157021253 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2232430 + ... + 2241440.

It is an arithmetic number, because the mean of its divisors is an integer number (1014417756).

Almost surely, 2^20157021285 is an apocalyptic number.

It is an amenable number.

20157021285 is a deficient number, since it is larger than the sum of its proper divisors (12304346907).

20157021285 is a wasteful number, since it uses less digits than its factorization.

20157021285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9973.

The product of its (nonzero) digits is 11200, while the sum is 33.

Adding to 20157021285 its reverse (58212075102), we get a palindrome (78369096387).

The spelling of 20157021285 in words is "twenty billion, one hundred fifty-seven million, twenty-one thousand, two hundred eighty-five".