20601811 has 4 divisors (see below), whose sum is σ = 20651400. Its totient is φ = 20552224.

The previous prime is 20601781. The next prime is 20601817. The reversal of 20601811 is 11810602.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11810602 = 2 ⋅5905301.

It is a cyclic number.

It is not a de Polignac number, because 20601811 - 2¹³ = 20593619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20601817) 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, 24166 + ... + 25003.

It is an arithmetic number, because the mean of its divisors is an integer number (5162850).

Almost surely, 2^20601811 is an apocalyptic number.

20601811 is a deficient number, since it is larger than the sum of its proper divisors (49589).

20601811 is an equidigital number, since it uses as much as digits as its factorization.

20601811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49588.

The product of its (nonzero) digits is 96, while the sum is 19.

The square root of 20601811 is about 4538.9217882665. The cubic root of 20601811 is about 274.1375115609.

It can be divided in two parts, 20601 and 811, that added together give a palindrome (21412).

The spelling of 20601811 in words is "twenty million, six hundred one thousand, eight hundred eleven".