20857803427 has 4 divisors (see below), whose sum is σ = 20858140296. Its totient is φ = 20857466560.

The previous prime is 20857803361. The next prime is 20857803431. The reversal of 20857803427 is 72430875802.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20857803427 - 2³¹ = 18710319779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20857803467) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45793 + ... + 209314.

It is an arithmetic number, because the mean of its divisors is an integer number (5214535074).

Almost surely, 2^20857803427 is an apocalyptic number.

20857803427 is a deficient number, since it is larger than the sum of its proper divisors (336869).

20857803427 is an equidigital number, since it uses as much as digits as its factorization.

20857803427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336868.

The product of its (nonzero) digits is 752640, while the sum is 46.

The spelling of 20857803427 in words is "twenty billion, eight hundred fifty-seven million, eight hundred three thousand, four hundred twenty-seven".