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20302390 = 253735443
BaseRepresentation
bin100110101110…
…0101000110110
31102012110122101
41031130220312
520144134030
62003052314
7334365433
oct115345066
942173571
1020302390
1110507539
12697109a
13428ac64
1429a6b8a
151bb07ca
hex135ca36

20302390 has 16 divisors (see below), whose sum is σ = 36649008. Its totient is φ = 8097696.

The previous prime is 20302367. The next prime is 20302397. The reversal of 20302390 is 9320302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20302397) 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, 1009 + ... + 6451.

It is an arithmetic number, because the mean of its divisors is an integer number (2290563).

Almost surely, 220302390 is an apocalyptic number.

20302390 is a deficient number, since it is larger than the sum of its proper divisors (16346618).

20302390 is a wasteful number, since it uses less digits than its factorization.

20302390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5823.

The product of its (nonzero) digits is 324, while the sum is 19.

The square root of 20302390 is about 4505.8173509365. The cubic root of 20302390 is about 272.8029456343.

Adding to 20302390 its reverse (9320302), we get a palindrome (29622692).

The spelling of 20302390 in words is "twenty million, three hundred two thousand, three hundred ninety".

Divisors: 1 2 5 10 373 746 1865 3730 5443 10886 27215 54430 2030239 4060478 10151195 20302390