20573633 has 2 divisors, whose sum is σ = 20573634. Its totient is φ = 20573632.

The previous prime is 20573627. The next prime is 20573647. The reversal of 20573633 is 33637502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12439729 + 8133904 = 3527^2 + 2852^2 .

It is a cyclic number.

It is not a de Polignac number, because 20573633 - 2¹⁰ = 20572609 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20573596 and 20573605.

It is not a weakly prime, because it can be changed into another prime (20573233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10286816 + 10286817.

It is an arithmetic number, because the mean of its divisors is an integer number (10286817).

Almost surely, 2^20573633 is an apocalyptic number.

It is an amenable number.

20573633 is a deficient number, since it is larger than the sum of its proper divisors (1).

20573633 is an equidigital number, since it uses as much as digits as its factorization.

20573633 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11340, while the sum is 29.

The square root of 20573633 is about 4535.8166850083. The cubic root of 20573633 is about 274.0124712387.

It can be divided in two parts, 205 and 73633, that multiplied together give a triangular number (15094765 = T₅₄₉₄).

The spelling of 20573633 in words is "twenty million, five hundred seventy-three thousand, six hundred thirty-three".