20897484 has 24 divisors (see below), whose sum is σ = 49896000. Its totient is φ = 6803664.

The previous prime is 20897483. The next prime is 20897497. The reversal of 20897484 is 48479802.

It is a super-3 number, since 3×20897484³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (20897483) 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, 19734 + ... + 20765.

It is an arithmetic number, because the mean of its divisors is an integer number (2079000).

Almost surely, 2^20897484 is an apocalyptic number.

It is an amenable number.

20897484 is an abundant number, since it is smaller than the sum of its proper divisors (28998516).

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

20897484 is a wasteful number, since it uses less digits than its factorization.

20897484 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40549 (or 40547 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 42.

The square root of 20897484 is about 4571.3765979188. The cubic root of 20897484 is about 275.4427424616.

The spelling of 20897484 in words is "twenty million, eight hundred ninety-seven thousand, four hundred eighty-four".