20051953 has 2 divisors, whose sum is σ = 20051954. Its totient is φ = 20051952.

The previous prime is 20051951. The next prime is 20051971. The reversal of 20051953 is 35915002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16581184 + 3470769 = 4072^2 + 1863^2 .

It is a cyclic number.

It is not a de Polignac number, because 20051953 - 2¹ = 20051951 is a prime.

It is a super-2 number, since 2×20051953² = 804161638228418, which contains 22 as substring.

Together with 20051951, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20051951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10025976 + 10025977.

It is an arithmetic number, because the mean of its divisors is an integer number (10025977).

Almost surely, 2^20051953 is an apocalyptic number.

It is an amenable number.

20051953 is a deficient number, since it is larger than the sum of its proper divisors (1).

20051953 is an equidigital number, since it uses as much as digits as its factorization.

20051953 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1350, while the sum is 25.

The square root of 20051953 is about 4477.9407097459. The cubic root of 20051953 is about 271.6765953355.

Adding to 20051953 its reverse (35915002), we get a palindrome (55966955).

The spelling of 20051953 in words is "twenty million, fifty-one thousand, nine hundred fifty-three".