20214545 has 16 divisors (see below), whose sum is σ = 26227152. Its totient is φ = 14868480.

The previous prime is 20214541. The next prime is 20214553. The reversal of 20214545 is 54541202.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 4477456 + 15737089 = 2116^2 + 3967^2 .

It is not a de Polignac number, because 20214545 - 2² = 20214541 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20214545.

It is not an unprimeable number, because it can be changed into a prime (20214541) 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 15 ways as a sum of consecutive naturals, for example, 22505 + ... + 23385.

It is an arithmetic number, because the mean of its divisors is an integer number (1639197).

Almost surely, 2^20214545 is an apocalyptic number.

It is an amenable number.

20214545 is a deficient number, since it is larger than the sum of its proper divisors (6012607).

20214545 is a wasteful number, since it uses less digits than its factorization.

20214545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1252.

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 20214545 is about 4496.0588296863. The cubic root of 20214545 is about 272.4089194245.

Adding to 20214545 its reverse (54541202), we get a palindrome (74755747).

The spelling of 20214545 in words is "twenty million, two hundred fourteen thousand, five hundred forty-five".