20012003257 has 2 divisors, whose sum is σ = 20012003258. Its totient is φ = 20012003256.

The previous prime is 20012003201. The next prime is 20012003287. The reversal of 20012003257 is 75230021002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17785956496 + 2226046761 = 133364^2 + 47181^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20012003257 is a prime.

It is not a weakly prime, because it can be changed into another prime (20012003287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10006001628 + 10006001629.

It is an arithmetic number, because the mean of its divisors is an integer number (10006001629).

Almost surely, 2^20012003257 is an apocalyptic number.

It is an amenable number.

20012003257 is a deficient number, since it is larger than the sum of its proper divisors (1).

20012003257 is an equidigital number, since it uses as much as digits as its factorization.

20012003257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 840, while the sum is 22.

Adding to 20012003257 its reverse (75230021002), we get a palindrome (95242024259).

The spelling of 20012003257 in words is "twenty billion, twelve million, three thousand, two hundred fifty-seven".