20886165544 has 8 divisors (see below), whose sum is σ = 39161560410. Its totient is φ = 10443082768.

The previous prime is 20886165539. The next prime is 20886165569. The reversal of 20886165544 is 44556168802.

It can be written as a sum of positive squares in only one way, i.e., 11764005444 + 9122160100 = 108462^2 + 95510^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-3 number, since 3×20886165544³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1305385339 + ... + 1305385354.

Almost surely, 2^20886165544 is an apocalyptic number.

It is an amenable number.

20886165544 is a deficient number, since it is larger than the sum of its proper divisors (18275394866).

20886165544 is a wasteful number, since it uses less digits than its factorization.

20886165544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2610770699 (or 2610770695 counting only the distinct ones).

The product of its (nonzero) digits is 1843200, while the sum is 49.

The spelling of 20886165544 in words is "twenty billion, eight hundred eighty-six million, one hundred sixty-five thousand, five hundred forty-four".