20916061 has 4 divisors (see below), whose sum is σ = 20966400. Its totient is φ = 20865724.

The previous prime is 20916053. The next prime is 20916073. The reversal of 20916061 is 16061902.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20916061 - 2³ = 20916053 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 (20976061) 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, 24541 + ... + 25378.

It is an arithmetic number, because the mean of its divisors is an integer number (5241600).

Almost surely, 2^20916061 is an apocalyptic number.

It is an amenable number.

20916061 is a deficient number, since it is larger than the sum of its proper divisors (50339).

20916061 is an equidigital number, since it uses as much as digits as its factorization.

20916061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50338.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 20916061 is about 4573.4080290304. The cubic root of 20916061 is about 275.5243373614.

Adding to 20916061 its reverse (16061902), we get a palindrome (36977963).

The spelling of 20916061 in words is "twenty million, nine hundred sixteen thousand, sixty-one".