20999765696546 has 32 divisors (see below), whose sum is σ = 40809261279360. Its totient is φ = 7870357529856.

The previous prime is 20999765696531. The next prime is 20999765696551. The reversal of 20999765696546 is 64569656799902.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3036399911 + ... + 3036406826.

It is an arithmetic number, because the mean of its divisors is an integer number (1275289414980).

Almost surely, 2^{20999765696546} is an apocalyptic number.

20999765696546 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

20999765696546 is a deficient number, since it is larger than the sum of its proper divisors (19809495582814).

20999765696546 is a wasteful number, since it uses less digits than its factorization.

20999765696546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6072806778.

The product of its (nonzero) digits is 11904278400, while the sum is 83.

The spelling of 20999765696546 in words is "twenty trillion, nine hundred ninety-nine billion, seven hundred sixty-five million, six hundred ninety-six thousand, five hundred forty-six".