20853459 has 24 divisors (see below), whose sum is σ = 33754032. Its totient is φ = 12294720.

The previous prime is 20853439. The next prime is 20853473. The reversal of 20853459 is 95435802.

It is not a de Polignac number, because 20853459 - 2⁹ = 20852947 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20853419) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 817 + ... + 6509.

It is an arithmetic number, because the mean of its divisors is an integer number (1406418).

Almost surely, 2^20853459 is an apocalyptic number.

20853459 is a deficient number, since it is larger than the sum of its proper divisors (12900573).

20853459 is a wasteful number, since it uses less digits than its factorization.

20853459 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5747 (or 5744 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The square root of 20853459 is about 4566.5587700149. The cubic root of 20853459 is about 275.2491802078.

It can be divided in two parts, 20853 and 459, that added together give a palindrome (21312).

The spelling of 20853459 in words is "twenty million, eight hundred fifty-three thousand, four hundred fifty-nine".