20800395 has 160 divisors (see below), whose sum is σ = 50181120. Its totient is φ = 7983360.

The previous prime is 20800393. The next prime is 20800399. The reversal of 20800395 is 59300802.

It is not a de Polignac number, because 20800395 - 2¹ = 20800393 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (20800393) by changing a digit.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 717241 + ... + 717269.

It is an arithmetic number, because the mean of its divisors is an integer number (313632).

Almost surely, 2^20800395 is an apocalyptic number.

20800395 is an abundant number, since it is smaller than the sum of its proper divisors (29380725).

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

20800395 is a wasteful number, since it uses less digits than its factorization.

20800395 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87 (or 78 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 20800395 is about 4560.7450049307. The cubic root of 20800395 is about 275.0155142763.

The spelling of 20800395 in words is "twenty million, eight hundred thousand, three hundred ninety-five".