20813587186802 has 4 divisors (see below), whose sum is σ = 31220380780206. Its totient is φ = 10406793593400.

The previous prime is 20813587186789. The next prime is 20813587186831. The reversal of 20813587186802 is 20868178531802.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 14687818635961 + 6125768550841 = 3832469^2 + 2475029^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5203396796699 + ... + 5203396796702.

Almost surely, 2^{20813587186802} is an apocalyptic number.

20813587186802 is a deficient number, since it is larger than the sum of its proper divisors (10406793593404).

20813587186802 is a wasteful number, since it uses less digits than its factorization.

20813587186802 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10406793593403.

The product of its (nonzero) digits is 10321920, while the sum is 59.

The spelling of 20813587186802 in words is "twenty trillion, eight hundred thirteen billion, five hundred eighty-seven million, one hundred eighty-six thousand, eight hundred two".