20790101 has 4 divisors (see below), whose sum is σ = 20800332. Its totient is φ = 20779872.

The previous prime is 20790083. The next prime is 20790103. The reversal of 20790101 is 10109702.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 10109702 = 2 ⋅5054851.

It can be written as a sum of positive squares in 2 ways, for example, as 7431076 + 13359025 = 2726^2 + 3655^2 .

It is a cyclic number.

It is not a de Polignac number, because 20790101 - 2¹⁸ = 20527957 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 (20790103) 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, 920 + ... + 6513.

It is an arithmetic number, because the mean of its divisors is an integer number (5200083).

Almost surely, 2^20790101 is an apocalyptic number.

It is an amenable number.

20790101 is a deficient number, since it is larger than the sum of its proper divisors (10231).

20790101 is an equidigital number, since it uses as much as digits as its factorization.

20790101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10230.

The product of its (nonzero) digits is 126, while the sum is 20.

The square root of 20790101 is about 4559.6163215779. The cubic root of 20790101 is about 274.9701389064.

Adding to 20790101 its reverse (10109702), we get a palindrome (30899803).

The spelling of 20790101 in words is "twenty million, seven hundred ninety thousand, one hundred one".