20708260700689 has 27 divisors (see below), whose sum is σ = 22280612272443. Its totient is φ = 19243935260784.

The previous prime is 20708260700663. The next prime is 20708260700693. The reversal of 20708260700689 is 98600706280702.

The square root of 20708260700689 is 4550633.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 14928525425025 + 5779735275664 = 3863745^2 + 2404108^2 .

It is not a de Polignac number, because 20708260700689 - 2¹⁷ = 20708260569617 is a prime.

It is a super-2 number, since 2×20708260700689² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20708260700609) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 4582485172 + ... + 4582489690.

Almost surely, 2^{20708260700689} is an apocalyptic number.

20708260700689 is the 4550633-rd square number.

20708260700689 is the 2275317-th centered octagonal number.

It is an amenable number.

20708260700689 is a deficient number, since it is larger than the sum of its proper divisors (1572351571754).

20708260700689 is an frugal number, since it uses more digits than its factorization.

20708260700689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9182 (or 4591 counting only the distinct ones).

The product of its (nonzero) digits is 4064256, while the sum is 55.

The spelling of 20708260700689 in words is "twenty trillion, seven hundred eight billion, two hundred sixty million, seven hundred thousand, six hundred eighty-nine".