20261312641 has 8 divisors (see below), whose sum is σ = 20482923240. Its totient is φ = 20040770688.

The previous prime is 20261312633. The next prime is 20261312647. The reversal of 20261312641 is 14621316202.

It can be written as a sum of positive squares in 4 ways, for example, as 237930625 + 20023382016 = 15425^2 + 141504^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20261312641 - 2³ = 20261312633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20261312647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 229006 + ... + 304903.

It is an arithmetic number, because the mean of its divisors is an integer number (2560365405).

Almost surely, 2^20261312641 is an apocalyptic number.

It is an amenable number.

20261312641 is a deficient number, since it is larger than the sum of its proper divisors (221610599).

20261312641 is a wasteful number, since it uses less digits than its factorization.

20261312641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 534323.

The product of its (nonzero) digits is 3456, while the sum is 28.

Adding to 20261312641 its reverse (14621316202), we get a palindrome (34882628843).

The spelling of 20261312641 in words is "twenty billion, two hundred sixty-one million, three hundred twelve thousand, six hundred forty-one".