20129029 has 8 divisors (see below), whose sum is σ = 20696472. Its totient is φ = 19568640.

The previous prime is 20129023. The next prime is 20129047. The reversal of 20129029 is 92092102.

It can be written as a sum of positive squares in 4 ways, for example, as 1896129 + 18232900 = 1377^2 + 4270^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20129029 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20128994 and 20129012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20129023) 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, 4309 + ... + 7669.

It is an arithmetic number, because the mean of its divisors is an integer number (2587059).

Almost surely, 2^20129029 is an apocalyptic number.

It is an amenable number.

20129029 is a deficient number, since it is larger than the sum of its proper divisors (567443).

20129029 is a wasteful number, since it uses less digits than its factorization.

20129029 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3527.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 20129029 is about 4486.5386435425. The cubic root of 20129029 is about 272.0242418201.

The spelling of 20129029 in words is "twenty million, one hundred twenty-nine thousand, twenty-nine".