20847401 has 2 divisors, whose sum is σ = 20847402. Its totient is φ = 20847400.

The previous prime is 20847397. The next prime is 20847403. The reversal of 20847401 is 10474802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14592400 + 6255001 = 3820^2 + 2501^2 .

It is a cyclic number.

It is not a de Polignac number, because 20847401 - 2² = 20847397 is a prime.

It is a super-2 number, since 2×20847401² = 869228256909602, which contains 22 as substring.

Together with 20847403, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20847403) 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 as a sum of consecutive naturals, namely, 10423700 + 10423701.

It is an arithmetic number, because the mean of its divisors is an integer number (10423701).

Almost surely, 2^20847401 is an apocalyptic number.

It is an amenable number.

20847401 is a deficient number, since it is larger than the sum of its proper divisors (1).

20847401 is an equidigital number, since it uses as much as digits as its factorization.

20847401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1792, while the sum is 26.

The square root of 20847401 is about 4565.8954214918. The cubic root of 20847401 is about 275.2225240221. Note that the first 3 decimals are identical.

The spelling of 20847401 in words is "twenty million, eight hundred forty-seven thousand, four hundred one".