20601729 has 8 divisors (see below), whose sum is σ = 30521120. Its totient is φ = 13734468.

The previous prime is 20601703. The next prime is 20601743. The reversal of 20601729 is 92710602.

It is not a de Polignac number, because 20601729 - 2⁸ = 20601473 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 763027 = 20601729 / (2 + 0 + 6 + 0 + 1 + 7 + 2 + 9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20601769) 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, 381487 + ... + 381540.

It is an arithmetic number, because the mean of its divisors is an integer number (3815140).

Almost surely, 2^20601729 is an apocalyptic number.

It is an amenable number.

20601729 is a deficient number, since it is larger than the sum of its proper divisors (9919391).

20601729 is an equidigital number, since it uses as much as digits as its factorization.

20601729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 763036 (or 763030 counting only the distinct ones).

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

The square root of 20601729 is about 4538.9127552752. The cubic root of 20601729 is about 274.1371478501.

The spelling of 20601729 in words is "twenty million, six hundred one thousand, seven hundred twenty-nine".