20406147 has 8 divisors (see below), whose sum is σ = 27654480. Its totient is φ = 13380960.

The previous prime is 20406143. The next prime is 20406149. The reversal of 20406147 is 74160402.

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

It is not a de Polignac number, because 20406147 - 2² = 20406143 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20406143) 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, 55572 + ... + 55937.

It is an arithmetic number, because the mean of its divisors is an integer number (3456810).

Almost surely, 2^20406147 is an apocalyptic number.

20406147 is a deficient number, since it is larger than the sum of its proper divisors (7248333).

20406147 is a wasteful number, since it uses less digits than its factorization.

20406147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111573.

The product of its (nonzero) digits is 1344, while the sum is 24.

The square root of 20406147 is about 4517.3163493384. The cubic root of 20406147 is about 273.2668833443.

Adding to 20406147 its reverse (74160402), we get a palindrome (94566549).

The spelling of 20406147 in words is "twenty million, four hundred six thousand, one hundred forty-seven".