20961382406 has 16 divisors (see below), whose sum is σ = 32460524160. Its totient is φ = 10141295040.

The previous prime is 20961382357. The next prime is 20961382417. The reversal of 20961382406 is 60428316902.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 607490 + ... + 641066.

It is an arithmetic number, because the mean of its divisors is an integer number (2028782760).

Almost surely, 2^20961382406 is an apocalyptic number.

20961382406 is a deficient number, since it is larger than the sum of its proper divisors (11499141754).

20961382406 is a wasteful number, since it uses less digits than its factorization.

20961382406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43679.

The product of its (nonzero) digits is 124416, while the sum is 41.

The spelling of 20961382406 in words is "twenty billion, nine hundred sixty-one million, three hundred eighty-two thousand, four hundred six".