20799901 has 4 divisors (see below), whose sum is σ = 20874204. Its totient is φ = 20725600.

The previous prime is 20799893. The next prime is 20799913. The reversal of 20799901 is 10999702.

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 10074276 + 10725625 = 3174^2 + 3275^2 .

It is a cyclic number.

It is not a de Polignac number, because 20799901 - 2³ = 20799893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20799101) 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, 36730 + ... + 37291.

It is an arithmetic number, because the mean of its divisors is an integer number (5218551).

Almost surely, 2^20799901 is an apocalyptic number.

It is an amenable number.

20799901 is a deficient number, since it is larger than the sum of its proper divisors (74303).

20799901 is an equidigital number, since it uses as much as digits as its factorization.

20799901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74302.

The product of its (nonzero) digits is 10206, while the sum is 37.

The square root of 20799901 is about 4560.6908467906. The cubic root of 20799901 is about 275.0133370942.

The spelling of 20799901 in words is "twenty million, seven hundred ninety-nine thousand, nine hundred one".