20629645785 has 40 divisors (see below), whose sum is σ = 42263491776. Its totient is φ = 9430693920.

The previous prime is 20629645759. The next prime is 20629645811. The reversal of 20629645785 is 58754692602.

20629645785 is a `hidden beast` number, since 2 + 0 + 6 + 2 + 9 + 64 + 578 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (20629645759) and next prime (20629645811).

It is not a de Polignac number, because 20629645785 - 2⁵ = 20629645753 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 3635551 + ... + 3641220.

Almost surely, 2^20629645785 is an apocalyptic number.

It is an amenable number.

20629645785 is an abundant number, since it is smaller than the sum of its proper divisors (21633845991).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20629645785 is an equidigital number, since it uses as much as digits as its factorization.

20629645785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7276795 (or 7276786 counting only the distinct ones).

The product of its (nonzero) digits is 7257600, while the sum is 54.

The spelling of 20629645785 in words is "twenty billion, six hundred twenty-nine million, six hundred forty-five thousand, seven hundred eighty-five".