20572929 has 12 divisors (see below), whose sum is σ = 32002516. Its totient is φ = 12660192.

The previous prime is 20572913. The next prime is 20572931. The reversal of 20572929 is 92927502.

20572929 = 877² + 878² + ... + 902².

It can be written as a sum of positive squares in 2 ways, for example, as 859329 + 19713600 = 927^2 + 4440^2 .

It is not a de Polignac number, because 20572929 - 2⁴ = 20572913 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20572893 and 20572902.

It is not an unprimeable number, because it can be changed into a prime (20572429) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 87802 + ... + 88035.

Almost surely, 2^20572929 is an apocalyptic number.

It is an amenable number.

20572929 is a deficient number, since it is larger than the sum of its proper divisors (11429587).

20572929 is a wasteful number, since it uses less digits than its factorization.

20572929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175856 (or 175853 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 36.

The square root of 20572929 is about 4535.7390797972. The cubic root of 20572929 is about 274.0093457661.

The spelling of 20572929 in words is "twenty million, five hundred seventy-two thousand, nine hundred twenty-nine".