20256339951 has 40 divisors (see below), whose sum is σ = 31352745600. Its totient is φ = 13019590080.

The previous prime is 20256339893. The next prime is 20256339977. The reversal of 20256339951 is 15993365202.

20256339951 is a `hidden beast` number, since 2 + 0 + 2 + 5 + 633 + 9 + 9 + 5 + 1 = 666.

It is not a de Polignac number, because 20256339951 - 2²⁵ = 20222785519 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20256339897 and 20256339906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20256339991) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 660465 + ... + 690453.

It is an arithmetic number, because the mean of its divisors is an integer number (783818640).

Almost surely, 2^20256339951 is an apocalyptic number.

20256339951 is a deficient number, since it is larger than the sum of its proper divisors (11096405649).

20256339951 is a wasteful number, since it uses less digits than its factorization.

20256339951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30301 (or 30292 counting only the distinct ones).

The product of its (nonzero) digits is 437400, while the sum is 45.

The spelling of 20256339951 in words is "twenty billion, two hundred fifty-six million, three hundred thirty-nine thousand, nine hundred fifty-one".