20454155 has 8 divisors (see below), whose sum is σ = 25208592. Its totient is φ = 15920928.

The previous prime is 20454143. The next prime is 20454157. The reversal of 20454155 is 55145402.

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 20454155 - 2⁴ = 20454139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20454157) 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 7 ways as a sum of consecutive naturals, for example, 55097 + ... + 55466.

It is an arithmetic number, because the mean of its divisors is an integer number (3151074).

Almost surely, 2^20454155 is an apocalyptic number.

20454155 is a deficient number, since it is larger than the sum of its proper divisors (4754437).

20454155 is a wasteful number, since it uses less digits than its factorization.

20454155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110605.

The product of its (nonzero) digits is 4000, while the sum is 26.

The square root of 20454155 is about 4522.6270020863. The cubic root of 20454155 is about 273.4810136247.

Adding to 20454155 its reverse (55145402), we get a palindrome (75599557).

The spelling of 20454155 in words is "twenty million, four hundred fifty-four thousand, one hundred fifty-five".