20857871794 has 16 divisors (see below), whose sum is σ = 33995854080. Its totient is φ = 9561332880.

The previous prime is 20857871791. The next prime is 20857871819. The reversal of 20857871794 is 49717875802.

It is not an unprimeable number, because it can be changed into a prime (20857871791) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8851909 + ... + 8854264.

It is an arithmetic number, because the mean of its divisors is an integer number (2124740880).

Almost surely, 2^20857871794 is an apocalyptic number.

20857871794 is a deficient number, since it is larger than the sum of its proper divisors (13137982286).

20857871794 is a wasteful number, since it uses less digits than its factorization.

20857871794 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17706225.

The product of its (nonzero) digits is 7902720, while the sum is 58.

The spelling of 20857871794 in words is "twenty billion, eight hundred fifty-seven million, eight hundred seventy-one thousand, seven hundred ninety-four".