20799853 has 4 divisors (see below), whose sum is σ = 21470848. Its totient is φ = 20128860.

The previous prime is 20799847. The next prime is 20799869. The reversal of 20799853 is 35899702.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20799853 - 2²¹ = 18702701 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20799893) 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, 335451 + ... + 335512.

It is an arithmetic number, because the mean of its divisors is an integer number (5367712).

Almost surely, 2^20799853 is an apocalyptic number.

It is an amenable number.

20799853 is a deficient number, since it is larger than the sum of its proper divisors (670995).

20799853 is an equidigital number, since it uses as much as digits as its factorization.

20799853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 670994.

The product of its (nonzero) digits is 136080, while the sum is 43.

The square root of 20799853 is about 4560.6855844270. The cubic root of 20799853 is about 275.0131255443.

The spelling of 20799853 in words is "twenty million, seven hundred ninety-nine thousand, eight hundred fifty-three".