20506061 has 8 divisors (see below), whose sum is σ = 20829600. Its totient is φ = 20185200.

The previous prime is 20506051. The next prime is 20506067. The reversal of 20506061 is 16060502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20506061 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 (20506067) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18986 + ... + 20036.

It is an arithmetic number, because the mean of its divisors is an integer number (2603700).

Almost surely, 2^20506061 is an apocalyptic number.

It is an amenable number.

20506061 is a deficient number, since it is larger than the sum of its proper divisors (323539).

20506061 is a wasteful number, since it uses less digits than its factorization.

20506061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1339.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 20506061 is about 4528.3618450826. The cubic root of 20506061 is about 273.7121535358.

Adding to 20506061 its reverse (16060502), we get a palindrome (36566563).

The spelling of 20506061 in words is "twenty million, five hundred six thousand, sixty-one".