20864851 has 8 divisors (see below), whose sum is σ = 24353280. Its totient is φ = 17503368.

The previous prime is 20864849. The next prime is 20864863. The reversal of 20864851 is 15846802.

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 20864851 - 2¹ = 20864849 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20864821) 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, 31381 + ... + 32038.

It is an arithmetic number, because the mean of its divisors is an integer number (3044160).

Almost surely, 2^20864851 is an apocalyptic number.

20864851 is a deficient number, since it is larger than the sum of its proper divisors (3488429).

20864851 is an equidigital number, since it uses as much as digits as its factorization.

20864851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63473.

The product of its (nonzero) digits is 15360, while the sum is 34.

The square root of 20864851 is about 4567.8059284519. The cubic root of 20864851 is about 275.2992928829.

The spelling of 20864851 in words is "twenty million, eight hundred sixty-four thousand, eight hundred fifty-one".