20543953 has 2 divisors, whose sum is σ = 20543954. Its totient is φ = 20543952.

The previous prime is 20543951. The next prime is 20543969. The reversal of 20543953 is 35934502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17909824 + 2634129 = 4232^2 + 1623^2 .

It is a cyclic number.

It is not a de Polignac number, because 20543953 - 2¹ = 20543951 is a prime.

Together with 20543951, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20543951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10271976 + 10271977.

It is an arithmetic number, because the mean of its divisors is an integer number (10271977).

Almost surely, 2^20543953 is an apocalyptic number.

It is an amenable number.

20543953 is a deficient number, since it is larger than the sum of its proper divisors (1).

20543953 is an equidigital number, since it uses as much as digits as its factorization.

20543953 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16200, while the sum is 31.

The square root of 20543953 is about 4532.5437670253. The cubic root of 20543953 is about 273.8806422437.

The spelling of 20543953 in words is "twenty million, five hundred forty-three thousand, nine hundred fifty-three".