20803136 has 28 divisors (see below), whose sum is σ = 42066972. Its totient is φ = 10203648.

The previous prime is 20803129. The next prime is 20803141. The reversal of 20803136 is 63130802.

It can be written as a sum of positive squares in 2 ways, for example, as 18113536 + 2689600 = 4256^2 + 1640^2 .

It is a hoax number, since the sum of its digits (23) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 326 + ... + 6458.

Almost surely, 2^20803136 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 20803136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21033486).

20803136 is an abundant number, since it is smaller than the sum of its proper divisors (21263836).

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

20803136 is an equidigital number, since it uses as much as digits as its factorization.

20803136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6198 (or 6188 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 20803136 is about 4561.0454941822. The cubic root of 20803136 is about 275.0275939253.

Adding to 20803136 its reverse (63130802), we get a palindrome (83933938).

The spelling of 20803136 in words is "twenty million, eight hundred three thousand, one hundred thirty-six".