20195808 has 48 divisors (see below), whose sum is σ = 53778816. Its totient is φ = 6634880.

The previous prime is 20195789. The next prime is 20195827. The reversal of 20195808 is 80859102.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20195789) and next prime (20195827).

It is a tau number, because it is divible by the number of its divisors (48).

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5335 + ... + 8297.

It is an arithmetic number, because the mean of its divisors is an integer number (1120392).

Almost surely, 2^20195808 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 20195808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26889408).

20195808 is an abundant number, since it is smaller than the sum of its proper divisors (33583008).

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

20195808 is a wasteful number, since it uses less digits than its factorization.

20195808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3047 (or 3039 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 33.

The square root of 20195808 is about 4493.9746327722. The cubic root of 20195808 is about 272.3247275097.

The spelling of 20195808 in words is "twenty million, one hundred ninety-five thousand, eight hundred eight".