20730100 has 18 divisors (see below), whose sum is σ = 44984534. Its totient is φ = 8292000.

The previous prime is 20730079. The next prime is 20730109. The reversal of 20730100 is 103702.

It can be written as a sum of positive squares in 3 ways, for example, as 45796 + 20684304 = 214^2 + 4548^2 .

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 polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 103551 + ... + 103750.

Almost surely, 2^20730100 is an apocalyptic number.

20730100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20730100 is an abundant number, since it is smaller than the sum of its proper divisors (24254434).

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

20730100 is a wasteful number, since it uses less digits than its factorization.

20730100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207315 (or 207308 counting only the distinct ones).

The product of its (nonzero) digits is 42, while the sum is 13.

The square root of 20730100 is about 4553.0319568393. The cubic root of 20730100 is about 274.7053593598.

Adding to 20730100 its reverse (103702), we get a palindrome (20833802).

The spelling of 20730100 in words is "twenty million, seven hundred thirty thousand, one hundred".