20408061 has 8 divisors (see below), whose sum is σ = 28393920. Its totient is φ = 13013792.

The previous prime is 20408051. The next prime is 20408077. The reversal of 20408061 is 16080402.

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 20408061 - 2⁵ = 20408029 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20408051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 147816 + ... + 147953.

It is an arithmetic number, because the mean of its divisors is an integer number (3549240).

Almost surely, 2^20408061 is an apocalyptic number.

It is an amenable number.

20408061 is a deficient number, since it is larger than the sum of its proper divisors (7985859).

20408061 is a wasteful number, since it uses less digits than its factorization.

20408061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 295795.

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 20408061 is about 4517.5281958168. The cubic root of 20408061 is about 273.2754267906.

Adding to 20408061 its reverse (16080402), we get a palindrome (36488463).

It can be divided in two parts, 2040 and 8061, that added together give a palindrome (10101).

The spelling of 20408061 in words is "twenty million, four hundred eight thousand, sixty-one".