20838851 has 16 divisors (see below), whose sum is σ = 24496128. Its totient is φ = 17529600.

The previous prime is 20838847. The next prime is 20838863. The reversal of 20838851 is 15883802.

It is not a de Polignac number, because 20838851 - 2² = 20838847 is a prime.

It is a super-2 number, since 2×20838851² = 868515422000402, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20838841) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6515 + ... + 9171.

It is an arithmetic number, because the mean of its divisors is an integer number (1531008).

Almost surely, 2^20838851 is an apocalyptic number.

20838851 is a deficient number, since it is larger than the sum of its proper divisors (3657277).

20838851 is a wasteful number, since it uses less digits than its factorization.

20838851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2722.

The product of its (nonzero) digits is 15360, while the sum is 35.

The square root of 20838851 is about 4564.9590359608. The cubic root of 20838851 is about 275.1848938422.

The spelling of 20838851 in words is "twenty million, eight hundred thirty-eight thousand, eight hundred fifty-one".