20840674541 has 8 divisors (see below), whose sum is σ = 21042879000. Its totient is φ = 20638670400.

The previous prime is 20840674523. The next prime is 20840674549. The reversal of 20840674541 is 14547604802.

It can be written as a sum of positive squares in 4 ways, for example, as 3146088100 + 17694586441 = 56090^2 + 133021^2 .

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

It is a de Polignac number, because none of the positive numbers 2^k-20840674541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20840674549) 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, 163391 + ... + 261491.

It is an arithmetic number, because the mean of its divisors is an integer number (2630359875).

Almost surely, 2^20840674541 is an apocalyptic number.

It is an amenable number.

20840674541 is a deficient number, since it is larger than the sum of its proper divisors (202204459).

20840674541 is a wasteful number, since it uses less digits than its factorization.

20840674541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100159.

The product of its (nonzero) digits is 215040, while the sum is 41.

The spelling of 20840674541 in words is "twenty billion, eight hundred forty million, six hundred seventy-four thousand, five hundred forty-one".