20631604255 has 4 divisors (see below), whose sum is σ = 24757925112. Its totient is φ = 16505283400.

The previous prime is 20631604249. The next prime is 20631604283. The reversal of 20631604255 is 55240613602.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20631604255 - 2⁹ = 20631603743 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20631604255.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2063160421 + ... + 2063160430.

It is an arithmetic number, because the mean of its divisors is an integer number (6189481278).

Almost surely, 2^20631604255 is an apocalyptic number.

20631604255 is a deficient number, since it is larger than the sum of its proper divisors (4126320857).

20631604255 is an equidigital number, since it uses as much as digits as its factorization.

20631604255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4126320856.

The product of its (nonzero) digits is 43200, while the sum is 34.

The spelling of 20631604255 in words is "twenty billion, six hundred thirty-one million, six hundred four thousand, two hundred fifty-five".