20105454 has 8 divisors (see below), whose sum is σ = 40210920. Its totient is φ = 6701816.

The previous prime is 20105447. The next prime is 20105479. The reversal of 20105454 is 45450102.

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

20105454 is an admirable number.

It is a super-2 number, since 2×20105454² = 808458561092232, which contains 22 as substring.

20105454 is a modest number, since divided by 5454 gives 2010 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 20105454.

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, 1675449 + ... + 1675460.

It is an arithmetic number, because the mean of its divisors is an integer number (5026365).

Almost surely, 2^20105454 is an apocalyptic number.

20105454 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.

20105454 is a wasteful number, since it uses less digits than its factorization.

20105454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3350914.

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 20105454 is about 4483.9105700270. The cubic root of 20105454 is about 271.9180026047.

Adding to 20105454 its reverse (45450102), we get a palindrome (65555556).

The spelling of 20105454 in words is "twenty million, one hundred five thousand, four hundred fifty-four".