20853532 has 18 divisors (see below), whose sum is σ = 41755448. Its totient is φ = 8926872.

The previous prime is 20853529. The next prime is 20853541. The reversal of 20853532 is 23535802.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a self number, because there is not a number n which added to its sum of digits gives 20853532.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 23733 + ... + 24595.

Almost surely, 2^20853532 is an apocalyptic number.

It is an amenable number.

20853532 is an abundant number, since it is smaller than the sum of its proper divisors (20901916).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20853532 is an frugal number, since it uses more digits than its factorization.

20853532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1737 (or 872 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 20853532 is about 4566.5667628975. The cubic root of 20853532 is about 275.2495013882.

Multiplying 20853532 by its sum of digits (28), we get a square (583898896 = 24164²).

20853532 divided by its sum of digits (28) gives a square (744769 = 863²).

The spelling of 20853532 in words is "twenty million, eight hundred fifty-three thousand, five hundred thirty-two".