20256500444421 has 32 divisors (see below), whose sum is σ = 28503647124480. Its totient is φ = 12770246808704.

The previous prime is 20256500444399. The next prime is 20256500444437. The reversal of 20256500444421 is 12444400565202.

It is a cyclic number.

It is not a de Polignac number, because 20256500444421 - 2¹³ = 20256500436229 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20256500444421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20256500444221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 43905886 + ... + 44364848.

It is an arithmetic number, because the mean of its divisors is an integer number (890738972640).

Almost surely, 2^{20256500444421} is an apocalyptic number.

It is an amenable number.

20256500444421 is a deficient number, since it is larger than the sum of its proper divisors (8247146680059).

20256500444421 is a wasteful number, since it uses less digits than its factorization.

20256500444421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 466265.

The product of its (nonzero) digits is 307200, while the sum is 39.

The spelling of 20256500444421 in words is "twenty trillion, two hundred fifty-six billion, five hundred million, four hundred forty-four thousand, four hundred twenty-one".