20406529 has 12 divisors (see below), whose sum is σ = 24157588. Its totient is φ = 17123040.

The previous prime is 20406523. The next prime is 20406539. The reversal of 20406529 is 92560402.

It can be written as a sum of positive squares in 2 ways, for example, as 1046529 + 19360000 = 1023^2 + 4400^2 .

It is not a de Polignac number, because 20406529 - 2³ = 20406521 is a prime.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 20406497 and 20406506.

It is not an unprimeable number, because it can be changed into a prime (20406521) 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, 4914 + ... + 8059.

Almost surely, 2^20406529 is an apocalyptic number.

It is an amenable number.

20406529 is a deficient number, since it is larger than the sum of its proper divisors (3751059).

20406529 is a wasteful number, since it uses less digits than its factorization.

20406529 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13008 (or 12997 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 20406529 is about 4517.3586308815. The cubic root of 20406529 is about 273.2685885053.

The spelling of 20406529 in words is "twenty million, four hundred six thousand, five hundred twenty-nine".