20730106 has 8 divisors (see below), whose sum is σ = 32924340. Its totient is φ = 9755328.

The previous prime is 20730079. The next prime is 20730109. The reversal of 20730106 is 60103702.

It can be written as a sum of positive squares in 2 ways, for example, as 19936225 + 793881 = 4465^2 + 891^2 .

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

It is not an unprimeable number, because it can be changed into a prime (20730109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 304821 + ... + 304888.

Almost surely, 2^20730106 is an apocalyptic number.

20730106 is a deficient number, since it is larger than the sum of its proper divisors (12194234).

20730106 is a wasteful number, since it uses less digits than its factorization.

20730106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 609728.

The product of its (nonzero) digits is 252, while the sum is 19.

The square root of 20730106 is about 4553.0326157409. The cubic root of 20730106 is about 274.7053858629.

Adding to 20730106 its reverse (60103702), we get a palindrome (80833808).

The spelling of 20730106 in words is "twenty million, seven hundred thirty thousand, one hundred six".