20403953 has 2 divisors, whose sum is σ = 20403954. Its totient is φ = 20403952.

The previous prime is 20403941. The next prime is 20403959. The reversal of 20403953 is 35930402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11505664 + 8898289 = 3392^2 + 2983^2 .

It is a cyclic number.

It is not a de Polignac number, because 20403953 - 2¹² = 20399857 is a prime.

It is not a weakly prime, because it can be changed into another prime (20403959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10201976 + 10201977.

It is an arithmetic number, because the mean of its divisors is an integer number (10201977).

Almost surely, 2^20403953 is an apocalyptic number.

It is an amenable number.

20403953 is a deficient number, since it is larger than the sum of its proper divisors (1).

20403953 is an equidigital number, since it uses as much as digits as its factorization.

20403953 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3240, while the sum is 26.

The square root of 20403953 is about 4517.0734995127. The cubic root of 20403953 is about 273.2570894159.

The spelling of 20403953 in words is "twenty million, four hundred three thousand, nine hundred fifty-three".