20616354765 has 64 divisors (see below), whose sum is σ = 37948204800. Its totient is φ = 10606982400.

The previous prime is 20616354739. The next prime is 20616354817. The reversal of 20616354765 is 56745361602.

20616354765 is a `hidden beast` number, since 2 + 0 + 6 + 1 + 635 + 4 + 7 + 6 + 5 = 666.

It is not a de Polignac number, because 20616354765 - 2⁶ = 20616354701 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 20616354765.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 8694030 + ... + 8696400.

It is an arithmetic number, because the mean of its divisors is an integer number (592940700).

Almost surely, 2^20616354765 is an apocalyptic number.

It is an amenable number.

20616354765 is a deficient number, since it is larger than the sum of its proper divisors (17331850035).

20616354765 is a wasteful number, since it uses less digits than its factorization.

20616354765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4635 (or 4629 counting only the distinct ones).

The product of its (nonzero) digits is 907200, while the sum is 45.

The spelling of 20616354765 in words is "twenty billion, six hundred sixteen million, three hundred fifty-four thousand, seven hundred sixty-five".