20406061 has 8 divisors (see below), whose sum is σ = 22077440. Its totient is φ = 18749232.

The previous prime is 20406017. The next prime is 20406107. The reversal of 20406061 is 16060402.

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

It is a cyclic number.

It is not a de Polignac number, because 20406061 - 2⁹ = 20405549 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 (20406011) 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, 621 + ... + 6418.

It is an arithmetic number, because the mean of its divisors is an integer number (2759680).

Almost surely, 2^20406061 is an apocalyptic number.

It is an amenable number.

20406061 is a deficient number, since it is larger than the sum of its proper divisors (1671379).

20406061 is a wasteful number, since it uses less digits than its factorization.

20406061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7275.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 20406061 is about 4517.3068304024. The cubic root of 20406061 is about 273.2664994570.

Adding to 20406061 its reverse (16060402), we get a palindrome (36466463).

The spelling of 20406061 in words is "twenty million, four hundred six thousand, sixty-one".