20857680503 has 8 divisors (see below), whose sum is σ = 22962585360. Its totient is φ = 18787567680.

The previous prime is 20857680497. The next prime is 20857680551. The reversal of 20857680503 is 30508675802.

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 20857680503 - 2²⁴ = 20840903287 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20857680563) 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, 8696750 + ... + 8699147.

It is an arithmetic number, because the mean of its divisors is an integer number (2870323170).

Almost surely, 2^20857680503 is an apocalyptic number.

20857680503 is a deficient number, since it is larger than the sum of its proper divisors (2104904857).

20857680503 is a wasteful number, since it uses less digits than its factorization.

20857680503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17396017.

The product of its (nonzero) digits is 403200, while the sum is 44.

The spelling of 20857680503 in words is "twenty billion, eight hundred fifty-seven million, six hundred eighty thousand, five hundred three".