20810132 has 48 divisors (see below), whose sum is σ = 43666560. Its totient is φ = 8491392.

The previous prime is 20810129. The next prime is 20810177. The reversal of 20810132 is 23101802.

It is a self number, because there is not a number n which added to its sum of digits gives 20810132.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54719 + ... + 55097.

It is an arithmetic number, because the mean of its divisors is an integer number (909720).

Almost surely, 2^20810132 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 20810132, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21833280).

20810132 is an abundant number, since it is smaller than the sum of its proper divisors (22856428).

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

20810132 is a wasteful number, since it uses less digits than its factorization.

20810132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 480 (or 478 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 20810132 is about 4561.8123591397. The cubic root of 20810132 is about 275.0584206462.

Adding to 20810132 its reverse (23101802), we get a palindrome (43911934).

The spelling of 20810132 in words is "twenty million, eight hundred ten thousand, one hundred thirty-two".