20597808 has 80 divisors (see below), whose sum is σ = 66352896. Its totient is φ = 5349120.

The previous prime is 20597807. The next prime is 20597827. The reversal of 20597808 is 80879502.

It is not an unprimeable number, because it can be changed into a prime (20597803) 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, 910 + ... + 6482.

Almost surely, 2^20597808 is an apocalyptic number.

20597808 is a gapful number since it is divisible by the number (28) 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 20597808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33176448).

20597808 is an abundant number, since it is smaller than the sum of its proper divisors (45755088).

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

20597808 is a wasteful number, since it uses less digits than its factorization.

20597808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5602 (or 5596 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 39.

The square root of 20597808 is about 4538.4808030882. The cubic root of 20597808 is about 274.1197551359.

The spelling of 20597808 in words is "twenty million, five hundred ninety-seven thousand, eight hundred eight".