20255664534 has 32 divisors (see below), whose sum is σ = 46757074176. Its totient is φ = 5730031200.

The previous prime is 20255664529. The next prime is 20255664599. The reversal of 20255664534 is 43546655202.

It is a Harshad number since it is a multiple of its sum of digits (42).

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 15 ways as a sum of consecutive naturals, for example, 2383272 + ... + 2391755.

It is an arithmetic number, because the mean of its divisors is an integer number (1461158568).

Almost surely, 2^20255664534 is an apocalyptic number.

20255664534 is an abundant number, since it is smaller than the sum of its proper divisors (26501409642).

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

20255664534 is a wasteful number, since it uses less digits than its factorization.

20255664534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4775140.

The product of its (nonzero) digits is 864000, while the sum is 42.

The spelling of 20255664534 in words is "twenty billion, two hundred fifty-five million, six hundred sixty-four thousand, five hundred thirty-four".