20255399490 has 32 divisors (see below), whose sum is σ = 48657514176. Its totient is φ = 5396489280.

The previous prime is 20255399471. The next prime is 20255399503. The reversal of 20255399490 is 9499355202.

It is a happy number.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax 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 15 ways as a sum of consecutive naturals, for example, 276076 + ... + 341655.

It is an arithmetic number, because the mean of its divisors is an integer number (1520547318).

Almost surely, 2^20255399490 is an apocalyptic number.

20255399490 is an abundant number, since it is smaller than the sum of its proper divisors (28402114686).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20255399490 is a wasteful number, since it uses less digits than its factorization.

20255399490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 618834.

The product of its (nonzero) digits is 874800, while the sum is 48.

The spelling of 20255399490 in words is "twenty billion, two hundred fifty-five million, three hundred ninety-nine thousand, four hundred ninety".