20406039 has 8 divisors (see below), whose sum is σ = 27591552. Its totient is φ = 13412280.

The previous prime is 20406017. The next prime is 20406107. The reversal of 20406039 is 93060402.

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

It is not a de Polignac number, because 20406039 - 2⁷ = 20405911 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20406439) 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, 47689 + ... + 48114.

It is an arithmetic number, because the mean of its divisors is an integer number (3448944).

Almost surely, 2^20406039 is an apocalyptic number.

20406039 is a deficient number, since it is larger than the sum of its proper divisors (7185513).

20406039 is an equidigital number, since it uses as much as digits as its factorization.

20406039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95877.

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 20406039 is about 4517.3043953225. The cubic root of 20406039 is about 273.2664012531.

The spelling of 20406039 in words is "twenty million, four hundred six thousand, thirty-nine".