20914285921777 has 16 divisors (see below), whose sum is σ = 21310768353600. Its totient is φ = 20519241187840.

The previous prime is 20914285921769. The next prime is 20914285921909. The reversal of 20914285921777 is 77712958241902.

It is a cyclic number.

It is not a de Polignac number, because 20914285921777 - 2³ = 20914285921769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20914285921717) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64800918 + ... + 65122864.

It is an arithmetic number, because the mean of its divisors is an integer number (1331923022100).

Almost surely, 2^{20914285921777} is an apocalyptic number.

It is an amenable number.

20914285921777 is a deficient number, since it is larger than the sum of its proper divisors (396482431823).

20914285921777 is a wasteful number, since it uses less digits than its factorization.

20914285921777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324176.

The product of its (nonzero) digits is 35562240, while the sum is 64.

The spelling of 20914285921777 in words is "twenty trillion, nine hundred fourteen billion, two hundred eighty-five million, nine hundred twenty-one thousand, seven hundred seventy-seven".