20320056215 has 16 divisors (see below), whose sum is σ = 25450384896. Its totient is φ = 15545508000.

The previous prime is 20320056209. The next prime is 20320056241. The reversal of 20320056215 is 51265002302.

It is not a de Polignac number, because 20320056215 - 2¹⁸ = 20319794071 is a prime.

It is a Duffinian number.

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, 515870 + ... + 553860.

It is an arithmetic number, because the mean of its divisors is an integer number (1590649056).

Almost surely, 2^20320056215 is an apocalyptic number.

20320056215 is a deficient number, since it is larger than the sum of its proper divisors (5130328681).

20320056215 is a wasteful number, since it uses less digits than its factorization.

20320056215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42670.

The product of its (nonzero) digits is 3600, while the sum is 26.

Adding to 20320056215 its reverse (51265002302), we get a palindrome (71585058517).

The spelling of 20320056215 in words is "twenty billion, three hundred twenty million, fifty-six thousand, two hundred fifteen".