20853231 has 8 divisors (see below), whose sum is σ = 31776384. Its totient is φ = 11916120.

The previous prime is 20853229. The next prime is 20853257. The reversal of 20853231 is 13235802.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20853231 - 2¹ = 20853229 is a prime.

It is a super-2 number, since 2×20853231² = 869714486278722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20853031) 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, 496485 + ... + 496526.

It is an arithmetic number, because the mean of its divisors is an integer number (3972048).

Almost surely, 2^20853231 is an apocalyptic number.

20853231 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20853231 is a deficient number, since it is larger than the sum of its proper divisors (10923153).

20853231 is an equidigital number, since it uses as much as digits as its factorization.

20853231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 993021.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 20853231 is about 4566.5338058532. The cubic root of 20853231 is about 275.2481770642.

The spelling of 20853231 in words is "twenty million, eight hundred fifty-three thousand, two hundred thirty-one".