20150220256 has 24 divisors (see below), whose sum is σ = 39841021584. Its totient is φ = 10031865600.

The previous prime is 20150220221. The next prime is 20150220269. The reversal of 20150220256 is 65202205102.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 20150220256.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1343820 + ... + 1358731.

It is an arithmetic number, because the mean of its divisors is an integer number (1660042566).

Almost surely, 2^20150220256 is an apocalyptic number.

It is an amenable number.

20150220256 is a deficient number, since it is larger than the sum of its proper divisors (19690801328).

20150220256 is a wasteful number, since it uses less digits than its factorization.

20150220256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2702794 (or 2702786 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

Adding to 20150220256 its reverse (65202205102), we get a palindrome (85352425358).

The spelling of 20150220256 in words is "twenty billion, one hundred fifty million, two hundred twenty thousand, two hundred fifty-six".