20529897 has 16 divisors (see below), whose sum is σ = 29315520. Its totient is φ = 12733952.

The previous prime is 20529881. The next prime is 20529911. The reversal of 20529897 is 79892502.

20529897 is nontrivially palindromic in base 7.

It is not a de Polignac number, because 20529897 - 2⁴ = 20529881 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (20529097) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2278 + ... + 6800.

It is an arithmetic number, because the mean of its divisors is an integer number (1832220).

Almost surely, 2^20529897 is an apocalyptic number.

It is an amenable number.

20529897 is a deficient number, since it is larger than the sum of its proper divisors (8785623).

20529897 is a wasteful number, since it uses less digits than its factorization.

20529897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4632.

The product of its (nonzero) digits is 90720, while the sum is 42.

The square root of 20529897 is about 4530.9929375359. The cubic root of 20529897 is about 273.8181657149.

The spelling of 20529897 in words is "twenty million, five hundred twenty-nine thousand, eight hundred ninety-seven".