20853197 has 8 divisors (see below), whose sum is σ = 21309120. Its totient is φ = 20401920.

The previous prime is 20853193. The next prime is 20853227. The reversal of 20853197 is 79135802.

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 20853197 - 2² = 20853193 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20853193) 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, 8813 + ... + 10925.

It is an arithmetic number, because the mean of its divisors is an integer number (2663640).

Almost surely, 2^20853197 is an apocalyptic number.

It is an amenable number.

20853197 is a deficient number, since it is larger than the sum of its proper divisors (455923).

20853197 is a wasteful number, since it uses less digits than its factorization.

20853197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2323.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 20853197 is about 4566.5300831156. The cubic root of 20853197 is about 275.2480274720.

Adding to 20853197 its reverse (79135802), we get a palindrome (99988999).

The spelling of 20853197 in words is "twenty million, eight hundred fifty-three thousand, one hundred ninety-seven".