20105315256 has 32 divisors (see below), whose sum is σ = 54129695760. Its totient is φ = 6186250752.

The previous prime is 20105315239. The next prime is 20105315273. The reversal of 20105315256 is 65251350102.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20105315239) and next prime (20105315273).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32219745 + ... + 32220368.

Almost surely, 2^20105315256 is an apocalyptic number.

20105315256 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

20105315256 is an abundant number, since it is smaller than the sum of its proper divisors (34024380504).

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

20105315256 is a wasteful number, since it uses less digits than its factorization.

20105315256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64440135 (or 64440131 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 30.

Adding to 20105315256 its reverse (65251350102), we get a palindrome (85356665358).

The spelling of 20105315256 in words is "twenty billion, one hundred five million, three hundred fifteen thousand, two hundred fifty-six".