220129729 has 4 divisors (see below), whose sum is σ = 227230720. Its totient is φ = 213028740.

The previous prime is 220129703. The next prime is 220129733. The reversal of 220129729 is 927921022.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 220129729 - 2¹¹ = 220127681 is a prime.

It is a super-2 number, since 2×220129729² = 96914195179226882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 220129694 and 220129703.

It is not an unprimeable number, because it can be changed into a prime (220129739) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3550449 + ... + 3550510.

It is an arithmetic number, because the mean of its divisors is an integer number (56807680).

Almost surely, 2^220129729 is an apocalyptic number.

It is an amenable number.

220129729 is a deficient number, since it is larger than the sum of its proper divisors (7100991).

220129729 is an equidigital number, since it uses as much as digits as its factorization.

220129729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7100990.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 220129729 is about 14836.7694933904. The cubic root of 220129729 is about 603.7997093669.

The spelling of 220129729 in words is "two hundred twenty million, one hundred twenty-nine thousand, seven hundred twenty-nine".