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20730030 = 235691001
BaseRepresentation
bin100111100010…
…1000010101110
31110000012020220
41033011002232
520301330110
62020152210
7341126256
oct117050256
943005226
1020730030
1110779862
126b38666
1343aa7b9
142a78966
151c47370
hex13c50ae

20730030 has 16 divisors (see below), whose sum is σ = 49752144. Its totient is φ = 5528000.

The previous prime is 20730011. The next prime is 20730037. The reversal of 20730030 is 3003702.

Adding to 20730030 its reverse (3003702), we get a palindrome (23733732).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a junction number, because it is equal to n+sod(n) for n = 20729991 and 20730009.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20730037) 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, 345471 + ... + 345530.

It is an arithmetic number, because the mean of its divisors is an integer number (3109509).

Almost surely, 220730030 is an apocalyptic number.

20730030 is an abundant number, since it is smaller than the sum of its proper divisors (29022114).

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

20730030 is a wasteful number, since it uses less digits than its factorization.

20730030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 691011.

The product of its (nonzero) digits is 126, while the sum is 15.

The square root of 20730030 is about 4553.0242696476. The cubic root of 20730030 is about 274.7050501573.

The spelling of 20730030 in words is "twenty million, seven hundred thirty thousand, thirty".

Divisors: 1 2 3 5 6 10 15 30 691001 1382002 2073003 3455005 4146006 6910010 10365015 20730030