20106729 has 6 divisors (see below), whose sum is σ = 29043066. Its totient is φ = 13404480.

The previous prime is 20106727. The next prime is 20106743. The reversal of 20106729 is 92760102.

It can be written as a sum of positive squares in only one way, i.e., 19713600 + 393129 = 4440^2 + 627^2 .

It is not a de Polignac number, because 20106729 - 2¹ = 20106727 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20106721) 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, 1117032 + ... + 1117049.

It is an arithmetic number, because the mean of its divisors is an integer number (4840511).

Almost surely, 2^20106729 is an apocalyptic number.

It is an amenable number.

20106729 is a deficient number, since it is larger than the sum of its proper divisors (8936337).

20106729 is a wasteful number, since it uses less digits than its factorization.

20106729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2234087 (or 2234084 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 20106729 is about 4484.0527427763. The cubic root of 20106729 is about 271.9237504335.

The spelling of 20106729 in words is "twenty million, one hundred six thousand, seven hundred twenty-nine".