20396808 has 24 divisors (see below), whose sum is σ = 55241550. Its totient is φ = 6798912.

The previous prime is 20396807. The next prime is 20396813. The reversal of 20396808 is 80869302.

It can be written as a sum of positive squares in only one way, i.e., 19554084 + 842724 = 4422^2 + 918^2 .

It is a tau number, because it is divible by the number of its divisors (24).

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

It is not an unprimeable number, because it can be changed into a prime (20396807) 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, 141573 + ... + 141716.

Almost surely, 2^20396808 is an apocalyptic number.

It is an amenable number.

20396808 is an abundant number, since it is smaller than the sum of its proper divisors (34844742).

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

20396808 is a wasteful number, since it uses less digits than its factorization.

20396808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283301 (or 283294 counting only the distinct ones).

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

The square root of 20396808 is about 4516.2825420914. The cubic root of 20396808 is about 273.2251895540.

The spelling of 20396808 in words is "twenty million, three hundred ninety-six thousand, eight hundred eight".