20681274669 has 16 divisors (see below), whose sum is σ = 30089150784. Its totient is φ = 12531065600.

The previous prime is 20681274617. The next prime is 20681274671. The reversal of 20681274669 is 96647218602.

It is a cyclic number.

It is not a de Polignac number, because 20681274669 - 2¹⁷ = 20681143597 is a prime.

It is a super-2 number, since 2×20681274669² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20681274169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66067 + ... + 213839.

It is an arithmetic number, because the mean of its divisors is an integer number (1880571924).

Almost surely, 2^20681274669 is an apocalyptic number.

It is an amenable number.

20681274669 is a deficient number, since it is larger than the sum of its proper divisors (9407876115).

20681274669 is a wasteful number, since it uses less digits than its factorization.

20681274669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152028.

The product of its (nonzero) digits is 1741824, while the sum is 51.

It can be divided in two parts, 206 and 81274669, that added together give a triangular number (81274875 = T₁₂₇₄₉).

The spelling of 20681274669 in words is "twenty billion, six hundred eighty-one million, two hundred seventy-four thousand, six hundred sixty-nine".