20634961845 has 16 divisors (see below), whose sum is σ = 34958053440. Its totient is φ = 10357941504.

The previous prime is 20634961817. The next prime is 20634961931. The reversal of 20634961845 is 54816943602.

It is not a de Polignac number, because 20634961845 - 2⁷ = 20634961717 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20634961794 and 20634961803.

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 15 ways as a sum of consecutive naturals, for example, 40460455 + ... + 40460964.

It is an arithmetic number, because the mean of its divisors is an integer number (2184878340).

Almost surely, 2^20634961845 is an apocalyptic number.

It is an amenable number.

20634961845 is a deficient number, since it is larger than the sum of its proper divisors (14323091595).

20634961845 is a wasteful number, since it uses less digits than its factorization.

20634961845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80921444.

The product of its (nonzero) digits is 1244160, while the sum is 48.

The spelling of 20634961845 in words is "twenty billion, six hundred thirty-four million, nine hundred sixty-one thousand, eight hundred forty-five".