20626466639769 has 27 divisors (see below), whose sum is σ = 30106033098687. Its totient is φ = 13608343108224.

The previous prime is 20626466639761. The next prime is 20626466639903. The reversal of 20626466639769 is 96793666462602.

The square root of 20626466639769 is 4541637.

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., 9262070523225 + 11364396116544 = 3043365^2 + 3371112^2 .

It is not a de Polignac number, because 20626466639769 - 2³ = 20626466639761 is a prime.

It is a super-2 number, since 2×20626466639769² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20626466639697 and 20626466639706.

It is not an unprimeable number, because it can be changed into a prime (20626466639761) 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, 1321608564 + ... + 1321624170.

Almost surely, 2^{20626466639769} is an apocalyptic number.

20626466639769 is the 4541637-th square number.

20626466639769 is the 2270819-th centered octagonal number.

It is an amenable number.

20626466639769 is a deficient number, since it is larger than the sum of its proper divisors (9479566458918).

20626466639769 is an frugal number, since it uses more digits than its factorization.

20626466639769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31414 (or 15707 counting only the distinct ones).

The product of its (nonzero) digits is 1269789696, while the sum is 72.

The spelling of 20626466639769 in words is "twenty trillion, six hundred twenty-six billion, four hundred sixty-six million, six hundred thirty-nine thousand, seven hundred sixty-nine".