20766129 has 8 divisors (see below), whose sum is σ = 29316960. Its totient is φ = 13029696.

The previous prime is 20766127. The next prime is 20766133. The reversal of 20766129 is 92166702.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20766129 - 2¹ = 20766127 is a prime.

It is a super-2 number, since 2×20766129² = 862464227289282, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20766129.

It is not an unprimeable number, because it can be changed into a prime (20766121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 203539 + ... + 203640.

It is an arithmetic number, because the mean of its divisors is an integer number (3664620).

Almost surely, 2^20766129 is an apocalyptic number.

It is an amenable number.

20766129 is a deficient number, since it is larger than the sum of its proper divisors (8550831).

20766129 is a wasteful number, since it uses less digits than its factorization.

20766129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 407199.

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 20766129 is about 4556.9868334240. The cubic root of 20766129 is about 274.8644136020.

It can be divided in two parts, 207661 and 29, that added together give a triangular number (207690 = T₆₄₄).

The spelling of 20766129 in words is "twenty million, seven hundred sixty-six thousand, one hundred twenty-nine".