20985453 has 32 divisors (see below), whose sum is σ = 33177600. Its totient is φ = 13079088.

The previous prime is 20985449. The next prime is 20985467. The reversal of 20985453 is 35458902.

20985453 is a `hidden beast` number, since 20 + 98 + 545 + 3 = 666.

It is not a de Polignac number, because 20985453 - 2² = 20985449 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20985413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28828 + ... + 29546.

It is an arithmetic number, because the mean of its divisors is an integer number (1036800).

Almost surely, 2^20985453 is an apocalyptic number.

20985453 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

20985453 is a deficient number, since it is larger than the sum of its proper divisors (12192147).

20985453 is a wasteful number, since it uses less digits than its factorization.

20985453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 798 (or 792 counting only the distinct ones).

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

The square root of 20985453 is about 4580.9882121656. The cubic root of 20985453 is about 275.8286980497.

The spelling of 20985453 in words is "twenty million, nine hundred eighty-five thousand, four hundred fifty-three".