20135340868 has 12 divisors (see below), whose sum is σ = 35239723372. Its totient is φ = 10066848480.

The previous prime is 20135340859. The next prime is 20135340887. The reversal of 20135340868 is 86804353102.

It can be written as a sum of positive squares in 2 ways, for example, as 4619649024 + 15515691844 = 67968^2 + 124562^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20135340868.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 148623 + ... + 249718.

Almost surely, 2^20135340868 is an apocalyptic number.

It is an amenable number.

20135340868 is a deficient number, since it is larger than the sum of its proper divisors (15104382504).

20135340868 is a wasteful number, since it uses less digits than its factorization.

20135340868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410982 (or 410980 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 40.

The spelling of 20135340868 in words is "twenty billion, one hundred thirty-five million, three hundred forty thousand, eight hundred sixty-eight".