20008969785 has 64 divisors (see below), whose sum is σ = 40673525760. Its totient is φ = 9142372800.

The previous prime is 20008969751. The next prime is 20008969789. The reversal of 20008969785 is 58796980002.

It is a happy number.

It is not a de Polignac number, because 20008969785 - 2¹² = 20008965689 is a prime.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (20008969789) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2512560 + ... + 2520510.

It is an arithmetic number, because the mean of its divisors is an integer number (635523840).

Almost surely, 2^20008969785 is an apocalyptic number.

It is an amenable number.

20008969785 is an abundant number, since it is smaller than the sum of its proper divisors (20664555975).

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

20008969785 is a wasteful number, since it uses less digits than its factorization.

20008969785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10635 (or 10629 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 54.

The spelling of 20008969785 in words is "twenty billion, eight million, nine hundred sixty-nine thousand, seven hundred eighty-five".