20406454 has 8 divisors (see below), whose sum is σ = 30953880. Its totient is φ = 10088496.

The previous prime is 20406439. The next prime is 20406461. The reversal of 20406454 is 45460402.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57144 + ... + 57499.

It is an arithmetic number, because the mean of its divisors is an integer number (3869235).

Almost surely, 2^20406454 is an apocalyptic number.

20406454 is a deficient number, since it is larger than the sum of its proper divisors (10547426).

20406454 is a wasteful number, since it uses less digits than its factorization.

20406454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114734.

The product of its (nonzero) digits is 3840, while the sum is 25.

The square root of 20406454 is about 4517.3503295627. The cubic root of 20406454 is about 273.2682537241.

Adding to 20406454 its reverse (45460402), we get a palindrome (65866856).

The spelling of 20406454 in words is "twenty million, four hundred six thousand, four hundred fifty-four".