20892100681 has 3 divisors (see below), whose sum is σ = 20892245223. Its totient is φ = 20891956140.

The previous prime is 20892100667. The next prime is 20892100739. The reversal of 20892100681 is 18600129802.

The square root of 20892100681 is 144541.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 18600129802 = 2 ⋅9300064901.

It can be written as a sum of positive squares in only one way, i.e., 20374993081 + 517107600 = 142741^2 + 22740^2 .

It is not a de Polignac number, because 20892100681 - 2¹⁹ = 20891576393 is a prime.

It is a super-2 number, since 2×20892100681² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20892100681.

It is not an unprimeable number, because it can be changed into a prime (20892100381) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 72271 + ... + 216811.

It is an arithmetic number, because the mean of its divisors is an integer number (6964081741).

Almost surely, 2^20892100681 is an apocalyptic number.

20892100681 is the 144541-st square number.

20892100681 is the 72271-st centered octagonal number.

It is an amenable number.

20892100681 is a deficient number, since it is larger than the sum of its proper divisors (144542).

20892100681 is an frugal number, since it uses more digits than its factorization.

20892100681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289082 (or 144541 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 37.

The spelling of 20892100681 in words is "twenty billion, eight hundred ninety-two million, one hundred thousand, six hundred eighty-one".