20211061 has 4 divisors (see below), whose sum is σ = 21765772. Its totient is φ = 18656352.

The previous prime is 20211031. The next prime is 20211077. The reversal of 20211061 is 16011202.

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 938961 + 19272100 = 969^2 + 4390^2 .

It is not a de Polignac number, because 20211061 - 2¹⁵ = 20178293 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 1554697 = 20211061 / (2 + 0 + 2 + 1 + 1 + 0 + 6 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20211001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 777336 + ... + 777361.

It is an arithmetic number, because the mean of its divisors is an integer number (5441443).

Almost surely, 2^20211061 is an apocalyptic number.

It is an amenable number.

20211061 is a deficient number, since it is larger than the sum of its proper divisors (1554711).

20211061 is a wasteful number, since it uses less digits than its factorization.

20211061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1554710.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 20211061 is about 4495.6713625442. The cubic root of 20211061 is about 272.3932685288.

Adding to 20211061 its reverse (16011202), we get a palindrome (36222263).

It can be divided in two parts, 202 and 11061, that multiplied together give a palindrome (2234322).

The spelling of 20211061 in words is "twenty million, two hundred eleven thousand, sixty-one".