20618496 has 144 divisors (see below), whose sum is σ = 64590400. Its totient is φ = 6469632.

The previous prime is 20618491. The next prime is 20618497. The reversal of 20618496 is 69481602.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 20618496.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20618491) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 131250 + ... + 131406.

Almost surely, 2^20618496 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20618496, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32295200).

20618496 is an abundant number, since it is smaller than the sum of its proper divisors (43971904).

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

20618496 is a wasteful number, since it uses less digits than its factorization.

20618496 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201 (or 181 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 20618496 is about 4540.7594078524. The cubic root of 20618496 is about 274.2114977774.

The spelling of 20618496 in words is "twenty million, six hundred eighteen thousand, four hundred ninety-six".