20787563542244 has 6 divisors (see below), whose sum is σ = 36378236198934. Its totient is φ = 10393781771120.

The previous prime is 20787563542223. The next prime is 20787563542247. The reversal of 20787563542244 is 44224536578702.

It can be written as a sum of positive squares in only one way, i.e., 18898478228644 + 1889085313600 = 4347238^2 + 1374440^2 .

It is not an unprimeable number, because it can be changed into a prime (20787563542247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2598445442777 + ... + 2598445442784.

It is an arithmetic number, because the mean of its divisors is an integer number (6063039366489).

Almost surely, 2^{20787563542244} is an apocalyptic number.

It is an amenable number.

20787563542244 is a deficient number, since it is larger than the sum of its proper divisors (15590672656690).

20787563542244 is a wasteful number, since it uses less digits than its factorization.

20787563542244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5196890885565 (or 5196890885563 counting only the distinct ones).

The product of its (nonzero) digits is 90316800, while the sum is 59.

The spelling of 20787563542244 in words is "twenty trillion, seven hundred eighty-seven billion, five hundred sixty-three million, five hundred forty-two thousand, two hundred forty-four".