20853500 has 48 divisors (see below), whose sum is σ = 45995040. Its totient is φ = 8259200.

The previous prime is 20853499. The next prime is 20853517. The reversal of 20853500 is 535802.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 89384 + ... + 89616.

It is an arithmetic number, because the mean of its divisors is an integer number (958230).

Almost surely, 2^20853500 is an apocalyptic number.

20853500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20853500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22997520).

20853500 is an abundant number, since it is smaller than the sum of its proper divisors (25141540).

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

20853500 is a wasteful number, since it uses less digits than its factorization.

20853500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431 (or 419 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 20853500 is about 4566.5632591699. The cubic root of 20853500 is about 275.2493605969.

The spelling of 20853500 in words is "twenty million, eight hundred fifty-three thousand, five hundred".