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20404361 is a prime number
BaseRepresentation
bin100110111010…
…1100010001001
31102101122112002
41031311202021
520210414421
62005200345
7335301635
oct115654211
942348462
1020404361
111057710a
126a000b5
1342c54b3
1429d1dc5
151bd0b0b
hex1375889

20404361 has 2 divisors, whose sum is σ = 20404362. Its totient is φ = 20404360.

The previous prime is 20404343. The next prime is 20404387. The reversal of 20404361 is 16340402.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19009600 + 1394761 = 4360^2 + 1181^2 .

It is a cyclic number.

It is not a de Polignac number, because 20404361 - 210 = 20403337 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (20404331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10202180 + 10202181.

It is an arithmetic number, because the mean of its divisors is an integer number (10202181).

Almost surely, 220404361 is an apocalyptic number.

It is an amenable number.

20404361 is a deficient number, since it is larger than the sum of its proper divisors (1).

20404361 is an equidigital number, since it uses as much as digits as its factorization.

20404361 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 20404361 is about 4517.1186612707. The cubic root of 20404361 is about 273.2589107647.

Adding to 20404361 its reverse (16340402), we get a palindrome (36744763).

The spelling of 20404361 in words is "twenty million, four hundred four thousand, three hundred sixty-one".