20678347 has 2 divisors, whose sum is σ = 20678348. Its totient is φ = 20678346.

The previous prime is 20678323. The next prime is 20678351. The reversal of 20678347 is 74387602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20678347 - 2¹⁵ = 20645579 is a prime.

It is not a weakly prime, because it can be changed into another prime (20678447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10339173 + 10339174.

It is an arithmetic number, because the mean of its divisors is an integer number (10339174).

Almost surely, 2^20678347 is an apocalyptic number.

20678347 is a deficient number, since it is larger than the sum of its proper divisors (1).

20678347 is an equidigital number, since it uses as much as digits as its factorization.

20678347 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56448, while the sum is 37.

The square root of 20678347 is about 4547.3450495866. The cubic root of 20678347 is about 274.4765668675.

It can be divided in two parts, 20678 and 347, that added together give a square (21025 = 145²).

The spelling of 20678347 in words is "twenty million, six hundred seventy-eight thousand, three hundred forty-seven".