20529912 has 64 divisors (see below), whose sum is σ = 57204000. Its totient is φ = 6096384.

The previous prime is 20529911. The next prime is 20529917. The reversal of 20529912 is 21992502.

It is a self number, because there is not a number n which added to its sum of digits gives 20529912.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20529911) 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, 7914 + ... + 10182.

Almost surely, 2^20529912 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20529912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28602000).

20529912 is an abundant number, since it is smaller than the sum of its proper divisors (36674088).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20529912 is a wasteful number, since it uses less digits than its factorization.

20529912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2320 (or 2316 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 20529912 is about 4530.9945928019. The cubic root of 20529912 is about 273.8182324026.

The spelling of 20529912 in words is "twenty million, five hundred twenty-nine thousand, nine hundred twelve".