20346729 has 16 divisors (see below), whose sum is σ = 29410752. Its totient is φ = 12437568.

The previous prime is 20346727. The next prime is 20346749. The reversal of 20346729 is 92764302.

It is not a de Polignac number, because 20346729 - 2¹ = 20346727 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20346729.

It is not an unprimeable number, because it can be changed into a prime (20346721) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4462 + ... + 7784.

It is an arithmetic number, because the mean of its divisors is an integer number (1838172).

Almost surely, 2^20346729 is an apocalyptic number.

It is an amenable number.

20346729 is a deficient number, since it is larger than the sum of its proper divisors (9064023).

20346729 is a wasteful number, since it uses less digits than its factorization.

20346729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3496.

The product of its (nonzero) digits is 18144, while the sum is 33.

The square root of 20346729 is about 4510.7348625252. The cubic root of 20346729 is about 273.0013954228.

The spelling of 20346729 in words is "twenty million, three hundred forty-six thousand, seven hundred twenty-nine".