20453718 has 8 divisors (see below), whose sum is σ = 40907448. Its totient is φ = 6817904.

The previous prime is 20453717. The next prime is 20453743. The reversal of 20453718 is 81735402.

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

20453718 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20453717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1704471 + ... + 1704482.

It is an arithmetic number, because the mean of its divisors is an integer number (5113431).

Almost surely, 2^20453718 is an apocalyptic number.

20453718 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20453718 is a wasteful number, since it uses less digits than its factorization.

20453718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3408958.

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 20453718 is about 4522.5786891993. The cubic root of 20453718 is about 273.4790659837.

The spelling of 20453718 in words is "twenty million, four hundred fifty-three thousand, seven hundred eighteen".