20256261575 has 48 divisors (see below), whose sum is σ = 28658451456. Its totient is φ = 14058844800.

The previous prime is 20256261569. The next prime is 20256261577. The reversal of 20256261575 is 57516265202.

It is not a de Polignac number, because 20256261575 - 2⁴ = 20256261559 is a prime.

It is a super-2 number, since 2×20256261575² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20256261577) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 2925017 + ... + 2931933.

It is an arithmetic number, because the mean of its divisors is an integer number (597051072).

Almost surely, 2^20256261575 is an apocalyptic number.

20256261575 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20256261575 is a deficient number, since it is larger than the sum of its proper divisors (8402189881).

20256261575 is a wasteful number, since it uses less digits than its factorization.

20256261575 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7424 (or 7419 counting only the distinct ones).

The product of its (nonzero) digits is 252000, while the sum is 41.

The spelling of 20256261575 in words is "twenty billion, two hundred fifty-six million, two hundred sixty-one thousand, five hundred seventy-five".