20412694129 has 3 divisors (see below), whose sum is σ = 20412837003. Its totient is φ = 20412551256.

The previous prime is 20412694123. The next prime is 20412694157. The reversal of 20412694129 is 92149621402.

The square root of 20412694129 is 142873.

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: 92149621402 = 2 ⋅46074810701.

It can be written as a sum of positive squares in only one way, i.e., 17927871025 + 2484823104 = 133895^2 + 49848^2 .

It is not a de Polignac number, because 20412694129 - 2¹⁵ = 20412661361 is a prime.

It is a super-2 number, since 2×20412694129² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20412694091 and 20412694100.

It is not an unprimeable number, because it can be changed into a prime (20412694123) 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 2 ways as a sum of consecutive naturals, for example, 71437 + ... + 214309.

It is an arithmetic number, because the mean of its divisors is an integer number (6804279001).

Almost surely, 2^20412694129 is an apocalyptic number.

20412694129 is the 142873-rd square number.

20412694129 is the 71437-th centered octagonal number.

It is an amenable number.

20412694129 is a deficient number, since it is larger than the sum of its proper divisors (142874).

20412694129 is an frugal number, since it uses more digits than its factorization.

20412694129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285746 (or 142873 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 40.

The spelling of 20412694129 in words is "twenty billion, four hundred twelve million, six hundred ninety-four thousand, one hundred twenty-nine".