20256657945 has 16 divisors (see below), whose sum is σ = 32854636032. Its totient is φ = 10655556480.

The previous prime is 20256657937. The next prime is 20256657977. The reversal of 20256657945 is 54975665202.

It is a happy number.

It is not a de Polignac number, because 20256657945 - 2³ = 20256657937 is a prime.

It is a super-3 number, since 3×20256657945³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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, 9248521 + ... + 9250710.

It is an arithmetic number, because the mean of its divisors is an integer number (2053414752).

Almost surely, 2^20256657945 is an apocalyptic number.

It is an amenable number.

20256657945 is a deficient number, since it is larger than the sum of its proper divisors (12597978087).

20256657945 is a wasteful number, since it uses less digits than its factorization.

20256657945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18499312.

The product of its (nonzero) digits is 4536000, while the sum is 51.

The spelling of 20256657945 in words is "twenty billion, two hundred fifty-six million, six hundred fifty-seven thousand, nine hundred forty-five".