20448684 has 18 divisors (see below), whose sum is σ = 51689820. Its totient is φ = 6816216.

The previous prime is 20448661. The next prime is 20448689. The reversal of 20448684 is 48684402.

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-3 number, since 3×20448684³ (a number of 23 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 568019 = 20448684 / (2 + 0 + 4 + 4 + 8 + 6 + 8 + 4).

It is not an unprimeable number, because it can be changed into a prime (20448689) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 283974 + ... + 284045.

Almost surely, 2^20448684 is an apocalyptic number.

It is an amenable number.

20448684 is an abundant number, since it is smaller than the sum of its proper divisors (31241136).

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

20448684 is a wasteful number, since it uses less digits than its factorization.

20448684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 568029 (or 568024 counting only the distinct ones).

The product of its (nonzero) digits is 49152, while the sum is 36.

The square root of 20448684 is about 4522.0221140547. The cubic root of 20448684 is about 273.4566282281.

The spelling of 20448684 in words is "twenty million, four hundred forty-eight thousand, six hundred eighty-four".