20321440055 has 16 divisors (see below), whose sum is σ = 28462371840. Its totient is φ = 13638217632.

The previous prime is 20321440037. The next prime is 20321440067. The reversal of 20321440055 is 55004412302.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20321440055 - 2²⁸ = 20053004599 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6175085 + ... + 6178374.

It is an arithmetic number, because the mean of its divisors is an integer number (1778898240).

Almost surely, 2^20321440055 is an apocalyptic number.

20321440055 is a deficient number, since it is larger than the sum of its proper divisors (8140931785).

20321440055 is a wasteful number, since it uses less digits than its factorization.

20321440055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12353518.

The product of its (nonzero) digits is 4800, while the sum is 26.

Adding to 20321440055 its reverse (55004412302), we get a palindrome (75325852357).

The spelling of 20321440055 in words is "twenty billion, three hundred twenty-one million, four hundred forty thousand, fifty-five".