20840064740 has 36 divisors (see below), whose sum is σ = 48104386428. Its totient is φ = 7578204480.

The previous prime is 20840064689. The next prime is 20840064787. The reversal of 20840064740 is 4746004802.

It can be written as a sum of positive squares in 2 ways, for example, as 10134851584 + 10705213156 = 100672^2 + 103466^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20840064740.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4303379 + ... + 4308218.

Almost surely, 2^20840064740 is an apocalyptic number.

20840064740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20840064740 is an abundant number, since it is smaller than the sum of its proper divisors (27264321688).

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

20840064740 is a wasteful number, since it uses less digits than its factorization.

20840064740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8611628 (or 8611615 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 35.

The spelling of 20840064740 in words is "twenty billion, eight hundred forty million, sixty-four thousand, seven hundred forty".