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BaseRepresentation
bin100110101111…
…1001111010111
31102020000021002
41031133033113
520200004142
62003213515
7334441466
oct115371727
942200232
1020313047
1110514547
12697729b
134292a71
1429aa9dd
151bb3a32
hex135f3d7

20313047 has 2 divisors, whose sum is σ = 20313048. Its totient is φ = 20313046.

The previous prime is 20313001. The next prime is 20313067. The reversal of 20313047 is 74031302.

It is an a-pointer prime, because the next prime (20313067) can be obtained adding 20313047 to its sum of digits (20).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20313047 - 26 = 20312983 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20313067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10156523 + 10156524.

It is an arithmetic number, because the mean of its divisors is an integer number (10156524).

Almost surely, 220313047 is an apocalyptic number.

20313047 is a deficient number, since it is larger than the sum of its proper divisors (1).

20313047 is an equidigital number, since it uses as much as digits as its factorization.

20313047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 504, while the sum is 20.

The square root of 20313047 is about 4506.9997781229. Note that the first 3 decimals coincide. The cubic root of 20313047 is about 272.8506699409.

Adding to 20313047 its reverse (74031302), we get a palindrome (94344349).

The spelling of 20313047 in words is "twenty million, three hundred thirteen thousand, forty-seven".