20800001 has 4 divisors (see below), whose sum is σ = 21014532. Its totient is φ = 20585472.

The previous prime is 20799983. The next prime is 20800007. The reversal of 20800001 is 10000802.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17098225 + 3701776 = 4135^2 + 1924^2 .

It is a cyclic number.

It is not a de Polignac number, because 20800001 - 2⁶ = 20799937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20800007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107120 + ... + 107313.

It is an arithmetic number, because the mean of its divisors is an integer number (5253633).

Almost surely, 2^20800001 is an apocalyptic number.

It is an amenable number.

20800001 is a deficient number, since it is larger than the sum of its proper divisors (214531).

20800001 is an equidigital number, since it uses as much as digits as its factorization.

20800001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214530.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 20800001 is about 4560.7018100288. The cubic root of 20800001 is about 275.0137778221.

Adding to 20800001 its reverse (10000802), we get a palindrome (30800803).

The spelling of 20800001 in words is "twenty million, eight hundred thousand, one".