20730108 has 24 divisors (see below), whose sum is σ = 55280512. Its totient is φ = 5922864.

The previous prime is 20730079. The next prime is 20730109. The reversal of 20730108 is 80103702.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 123310 + ... + 123477.

Almost surely, 2^20730108 is an apocalyptic number.

20730108 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20730108 is an abundant number, since it is smaller than the sum of its proper divisors (34550404).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20730108 is a wasteful number, since it uses less digits than its factorization.

20730108 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246801 (or 246799 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 20730108 is about 4553.0328353747. The cubic root of 20730108 is about 274.7053946972.

The spelling of 20730108 in words is "twenty million, seven hundred thirty thousand, one hundred eight".