20530742636 has 6 divisors (see below), whose sum is σ = 35928799620. Its totient is φ = 10265371316.

The previous prime is 20530742629. The next prime is 20530742641. The reversal of 20530742636 is 63624703502.

It is a happy number.

It is a super-2 number, since 2×20530742636² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20530742636.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2566342826 + ... + 2566342833.

It is an arithmetic number, because the mean of its divisors is an integer number (5988133270).

Almost surely, 2^20530742636 is an apocalyptic number.

It is an amenable number.

20530742636 is a deficient number, since it is larger than the sum of its proper divisors (15398056984).

20530742636 is a wasteful number, since it uses less digits than its factorization.

20530742636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5132685663 (or 5132685661 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 38.

The spelling of 20530742636 in words is "twenty billion, five hundred thirty million, seven hundred forty-two thousand, six hundred thirty-six".