20212457 has 2 divisors, whose sum is σ = 20212458. Its totient is φ = 20212456.

The previous prime is 20212453. The next prime is 20212463. The reversal of 20212457 is 75421202.

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., 19678096 + 534361 = 4436^2 + 731^2 .

It is a cyclic number.

It is not a de Polignac number, because 20212457 - 2² = 20212453 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20212453) 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, 10106228 + 10106229.

It is an arithmetic number, because the mean of its divisors is an integer number (10106229).

Almost surely, 2^20212457 is an apocalyptic number.

It is an amenable number.

20212457 is a deficient number, since it is larger than the sum of its proper divisors (1).

20212457 is an equidigital number, since it uses as much as digits as its factorization.

20212457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1120, while the sum is 23.

The square root of 20212457 is about 4495.8266203225. The cubic root of 20212457 is about 272.3995398844.

Adding to 20212457 its reverse (75421202), we get a palindrome (95633659).

The spelling of 20212457 in words is "twenty million, two hundred twelve thousand, four hundred fifty-seven".