20710691869 has 6 divisors (see below), whose sum is σ = 24092029374. Its totient is φ = 17752021560.

The previous prime is 20710691857. The next prime is 20710691899. The reversal of 20710691869 is 96819601702.

It can be written as a sum of positive squares in only one way, i.e., 19033789369 + 1676902500 = 137963^2 + 40950^2 .

It is not a de Polignac number, because 20710691869 - 2⁷ = 20710691741 is a prime.

It is a super-2 number, since 2×20710691869² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (49), and also a Moran number because the ratio is a prime number: 422667181 = 20710691869 / (2 + 0 + 7 + 1 + 0 + 6 + 9 + 1 + 8 + 6 + 9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20710691819) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 211333542 + ... + 211333639.

It is an arithmetic number, because the mean of its divisors is an integer number (4015338229).

Almost surely, 2^20710691869 is an apocalyptic number.

It is an amenable number.

20710691869 is a deficient number, since it is larger than the sum of its proper divisors (3381337505).

20710691869 is an equidigital number, since it uses as much as digits as its factorization.

20710691869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 422667195 (or 422667188 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 49.

The spelling of 20710691869 in words is "twenty billion, seven hundred ten million, six hundred ninety-one thousand, eight hundred sixty-nine".